# Peterborough (UK Parliament constituency)

Peterborough is a borough constituency represented in the House of Commons of the Parliament of the United Kingdom since July 2024 by Andrew Pakes of the Labour Party.
Its current form is the direct, unbroken successor of a smaller constituency that was created in the mid-16th century returning two Members of Parliament (MPs) using the bloc vote system of election and represented in the House of Commons of England until 1707, then in the House of Commons of Great Britain from 1707 to 1800, and then in the House of Commons of the United Kingdom from 1801 to 1885. From 1885 onwards, the seat has elected one MP using the first-past-the-post system.

## Boundaries and boundary changes
### Prior to 1918

The earliest known members representing Peterborough were in 1547, shortly after it had gained city status, when Peterborough Cathedral became the seat of the new diocese of Peterborough in 1541. The cathedral had been Peterborough Abbey until the dissolution of the monasteries abolished it in 1539. The new city was not an ancient borough, nor a municipal borough until 1876; no charter survives granting the status of city or the right to Parliamentary representation or delimiting its boundary for electoral purposes.
The centre of the city was an extra-parochial area called the "Minster Precincts" comprising the cathedral close. The commissioners appointed prior to the parallel Great Reform Act 1832 and reported that Peterborough's parliamentary boundary, as far as was then known, comprised the Minster Precincts and the south-eastern part of the surrounding parish of Saint John the Baptist, excluding the parish's northern and western townships of Longthorpe, Dogsthorpe (or Dodsthorpe) and Newark-with-Eastfield. The borough franchise was scot and lot in the parish and householder in the Minster Precincts. For parliamentary purposes, the rest of the Soke of Peterborough, north and west of the city, was in the county constituency of Northamptonshire; the area south of the River Nene was in Huntingdonshire; to the east, Thorney was in Cambridgeshire.
The 1832 acts extended the parliamentary borough of Peterborough to the entire parish of Saint John the Baptist (adding 48 qualifying properties) and retained its two members. (The rural portion of the Soke was included in the Northern division of Northamptonshire.) Under the Boundary Act 1868, the area of New Fletton and Woodstone (south of the River Nene) was transferred from Huntingdonshire. Under the Redistribution of Seats Act 1885, the borough's representation was reduced from two MPs to one.

### 1918–1950

* The administrative county of the Soke of Peterborough (the Municipal Borough of Peterborough and the Rural Districts of Barnack and Peterborough);
* The Urban District of Oundle;
* The Rural Districts of Easton-on-the-Hill and Gretton; and
* Parts of the Rural Districts of Oundle and Thrapston
In 1918 the parliamentary borough was abolished and replaced with a new division of the parliamentary county of Northampton with the Soke of Peterborough, including the whole of the Soke (which had been created as a separate administrative county by the Local Government Act 1888) and neighbouring parts of the administrative county of Northamptonshire, absorbing the bulk of the abolished Northern division, incorporating Oundle and extending down to and beyond Thrapston and Corby.

### 1950–1974

* The Municipal Borough of Peterborough;
* The Urban District of Oundle;
* The Rural Districts of Barnack and Peterborough; and
* Part of the Rural District of Oundle and Thrapston
Designated as a county constituency under the revisions brought in for the 1950 general election by the Representation of the People Act 1948, with only minor changes to the boundaries of the constituency to reflect a rationalisation of the rural districts of Northamptonshire.

### 1974–1983

* The Municipal Borough of Peterborough; and
* The Rural Districts of Barnack, Peterborough and Thorney
In 1965 the administrative counties of the Soke of Peterborough and Huntingdonshire were combined to form Huntingdon and Peterborough. At the next redistribution, which came into effect for the February 1974 general election, the constituency was redesignated as a Borough Constituency, composed of the local authorities which had comprised the Soke, together with the sparsely populated Rural District of Thorney, which was transferred from the administrative county/constituency of Isle of Ely. The parts in Northamptonshire were transferred to Wellingborough.

### 1983–1997

* The City of Peterborough wards of Bretton, Central, Dogsthorpe, East, Fletton, North, Orton Longueville, Orton Waterville, Park, Paston, Ravensthorpe, Stanground, Walton and West
As a result of the Local Government Act 1972, the two counties of Huntingdon and Peterborough and Cambridgeshire and Isle of Ely were merged to form the non-metropolitan county of Cambridgeshire, with effect from 1 April 1974. However, the next redistribution did not come into effect until the 1983 general election, when areas to the south of the River Nene, including Fletton and the Ortons, which were now part of the expanded City of Peterborough, were transferred from the abolished constituency of Huntingdonshire. Mainly rural areas to the east (Thorney and Eye) and west (Barnack and Werrington) were transferred to the new constituencies of North East Cambridgeshire and Huntingdon respectively.

### 1997–2010

* The City of Peterborough wards of Bretton, Central, Dogsthorpe, East, North, Park, Paston, Ravensthorpe, Walton, Werrington and West
The next redistribution, which came into effect for the 1997 general election, saw the creation of North West Cambridgeshire, which took the areas to the south of the River Nene (City of Peterborough wards of Fletton, Orton Longueville, Orton Waterville and Stanground). Werrington was transferred back from Huntingdon.

### 2010–2024

* The City of Peterborough wards of Bretton North, Bretton South, Central, Dogsthorpe, East, Eye and Thorney, Newborough, North, Park, Paston, Ravensthorpe, Walton, Werrington North, Werrington South and West
Following their review of parliamentary representation in Cambridgeshire which came into effect for the 2010 general election, the Boundary Commission for England made minor alterations to the existing constituencies to deal with population changes, primarily the transfer back of Thorney and Eye from North East Cambridgeshire. There were also marginal changes to take account of the redistribution of City of Peterborough wards. These changes increased the electorate from 64,893 to 70,640. On the enumeration date of 17 February 2000, the electoral quota for England was 69,934 voters per constituency.

### Current

Further to the 2023 Periodic Review of Westminster constituencies, which came into effect for the 2024 general election, the composition of the constituency is as follows (as they existed on 1 December 2020):
* The City of Peterborough wards of: Bretton; Central; Dogsthorpe; East; Eye, Thorney & Newborough; Gunthorpe; North; Park; Paston & Walton; Ravensthorpe; Werrington; West.
Marginal loss due to further ward boundary changes.
The current constituency is composed of built-up areas of Peterborough to the north of the River Nene, as well as rural areas to the east and north and comprises approximately 60% of the electorate of the local authority of the City of Peterborough. Remaining parts of the city, composed of residential areas to the south of the River Nene and rural areas to the west of Peterborough form part of the North West Cambridgeshire constituency.

## Franchise

In the unreformed House of Commons the franchise for borough seats varied enormously. Originally the Dean of Peterborough and Cathedral Chapter had claimed the franchise and held that only residents of Minster Precincts were burgesses and so entitled to vote. By the interregnum, the city was one of 37 boroughs in which suffrage was restricted to those paying scot and lot, a form of municipal taxation. In 1800 there were 2,000 registered voters in Northamptonshire and 400 in Peterborough. By 1835 this was 576, or about one per cent of the population. Bribery was general until the introduction of the secret ballot under the Ballot Act 1872. Votes were cast by spoken declaration, in public, at the hustings, erected on the Market Place (now Cathedral Square).
The Great Reform Act 1832 enfranchised those who owned or leased land worth £10 or more and the Second Reform Act extended this to all householders paying £10 or more in rent per annum, effectively enfranchising the skilled working class, so by 1868 the percentage of voters in Peterborough had risen to about 20% of the population. The Third Reform Act extended the provisions of the previous act to the counties and the Fourth Reform Act widened suffrage further by abolishing practically all property qualifications for men and by enfranchising women over 30 who met minimum property qualifications. This system, known as universal manhood suffrage, was first used in the 1918 general election. However, full electoral equality would not occur until the Fifth Reform Act ten years later.
According to the 2001 census, the population count of Peterborough constituency is 95,103 persons, comprising 46,131 males and 48,972 females. 67.56% of those aged 16–74 are economically active, including 5.92% unemployed; a further 12.26% are retired and 3.08% students. Of a total 39,760 households, 63.80% are owner occupied, fewer than the regional (72.71%) and national (68.72%) averages. Turnout at the 2005 general election was 41,194 or 61.0% of those eligible to vote, below the regional (63.6%) and national (61.3%) figures.

## Members of Parliament

Peterborough sent two members to parliament for the first time in 1547. Before the civil war, many were relatives of the clergy; then for two hundred years after the restoration there was always a Fitzwilliam, or a Fitzwilliam nominee, sitting as member for Peterborough, making it a Whig stronghold. Representation was reduced to one member under the Redistribution of Seats Act 1885.
One of the earliest incumbents, Sir Walter Mildmay, member for Peterborough from 1553 to 1554, subsequently became Chancellor of the Exchequer from 1559 to 1589. Later, in the nineteenth century, William Elliot, Whig member from 1802 until his death in 1819, was Chief Secretary to the Lord Lieutenant of Ireland between 1806 and 1807; the Hon. William Lamb (later the 2nd Viscount Melbourne), Whig member from 1816 to 1819, became Home Secretary in 1830 then Prime Minister from 1834 to 1841; and Sir James Scarlett (later the 1st Baron Abinger), Whig member from 1819 to 1830, was, from 1827, Attorney General for England and Wales.
From the formal merger of the breakaway Liberal Unionists with the Conservatives in 1912 and the absorption of rural North Northamptonshire in 1918, Peterborough has been predominantly Conservative; however, it has elected Labour MPs several times from 1929 onwards.
Lord Burghley, as he then was, succeeded the socialist writer and illustrator, Frank Horrabin, who was born in the city and elected under the leadership of Ramsay MacDonald in 1929. David Cecil, 6th Marquess of Exeter, winner of 400m hurdles at the 1928 Summer Olympics, member of the International Olympic Committee for 48 years and chairman of the organising committee of the 1948 Summer Olympics, was the Conservative member from 1931 to 1943.
In 1966, in one of the closest polls in UK history, Sir Harmar Nicholls held the seat by three votes after seven recounts. Nicholls was the Conservative member from 1950 to 1974, when he lost in the October election of that year to Labour's Michael Ward, having held on by just 22 votes after four recounts in the election eight months earlier. The growth in the New Town from 1967 may in part account for Labour's victory here in 1974. In 1979, however, Ward lost the seat to the Conservative Brian Mawhinney, who would represent Peterborough for the entire duration of the incoming Conservative government and was a Cabinet Minister and Conservative Party Chairman during the second Major government (1992–97).
The seat was made more competitive in the 1997 boundary review by the formation of the North West Cambridgeshire seat, which incorporated the rural land outside Peterborough and several Conservative-inclined wards from the city. Since its formation, North West Cambridgeshire has been one of the safest Conservative seats in the country, whilst Peterborough was ranked 93rd in the Conservatives's one hundred most vulnerable seats (the ones which the other parties must take if there is to be a change of government) and 73rd on Labour's target list; these factors led Mawhinney to stand in North West Cambridgeshire instead. He retired as an MP in 2005 and was created Baron Mawhinney, of Peterborough in the county of Cambridgeshire.
Helen Clark (née Brinton) won the seat for Labour in 1997. She was defeated by Conservative candidate Stewart Jackson at the 2005 election, following which it was widely reported that Clark was planning to defect to the Conservative Party, an announcement which was not popular locally. However, by early June it emerged that while she had left the Labour Party, she had not in fact joined the Conservatives and did not intend to.
Jackson was re-elected in 2010 with an increased majority, which then fell in 2015. In 2017, Labour's Fiona Onasanya won a majority of 607; this result marked the first time since 1929 that Peterborough voted Labour in an election where the Conservatives won the national popular vote, and the first time it has ever elected a Labour MP in a year in which Labour did not form the government. Furthermore, Peterborough became one of five constituencies – the others being Croydon Central, Enfield Southgate, Leeds North West and Reading East – which elected Labour MPs in 2017 having not done so since 2001.

### Parliamentary borough 1547–1918
#### MPs 1542–1660

| Election | Senior member | Junior member |
| 1542 | Sir Thomas Moyle | |
| 1547 | Sir Wymond Carew, died and replaced in 1552 by John Campanett | Richard Pallady |
| March 1553 | Not known | Not known |
| Oct. 1553 | Sir Walter Mildmay | Sir William FitzWilliam |
| April 1554 | John Gamlin (Gamblin, Gamlyn) | Giles Isham |
| Nov. 1554 | William Liveley | Gilbert Bull |
| 1555 | Maurice Tyrell | John Mountsteven |
| 1558 | Giles Isham | Thomas Hussey |
| 1559 | Sir William FitzWilliam | Robert Wingfield Jr. |
| 1562 | John FitzWilliam | Robert Wingfield Jr. |
| 1571 | William Fitzwilliam | Henry Cheke, sat for Bedford and replaced by Brian Ansley |
| 1572 | Robert Wingfield Jr., died and replaced in 1581 by Sir William FitzWilliam | Hugh FitzWilliam died and replaced 1576 by Humphrey Mildmay |
| 1584 | William Fitzwilliam | James Scambler |
| 1586 | William Fitzwilliam | Thomas Hacke |
| 1589 | Sir Thomas Reede | Thomas Howland |
| 1593 | Sir Thomas Reede | William Hacke |
| 1597 | John Wingfield | Alexander Neville |
| 1601 | Nicholas Tufton | Goddard Pemberton |
| 1603 | Sir Richard Cecil of Wakerley | Edward Wymarke |
| 1614 | Sir William Walter | Roger Manwood |
| 1621 | Mildmay Fane | Walter Fitzwilliam |
| 1624 | Sir Francis Fane | Laurence Whitaker |
| 1625 | Sir Christopher Hatton | Laurence Whitaker |
| 1626 | Mildmay Fane, Lord Burghersh | Laurence Whitaker |
| 1628 | Mildmay Fane, Lord Burghersh | Laurence Whitaker |
| The Short Parliament (April–May 1640) |||
| April 1640 | David Cecil | William FitzWilliam, 2nd Baron FitzWilliam |
| The Long Parliament (1640–1648), the Rump Parliament (1648–1653) and the Barebone's Parliament (1653) |||
| Nov. 1640 | William FitzWilliam, 2nd Baron FitzWilliam | Sir Robert Napier, 2nd Baronet |
| The First Protectorate Parliament (1654–1655); one member only |||
| 1654 | Col. Alexander Blake | Col. Alexander Blake |
| The Second (1656–1658) and Third (1659) Protectorate Parliaments |||
| 1656 | Col. Alexander Blake | Francis St John |

#### MPs 1660–1883

The Tories (or Abhorrers) and Whigs (or Petitioners) originated in the Court and Country parties that emerged in the aftermath of the civil war, although it is more accurate to describe them as loose tendencies, both of which might be regarded as conservative in modern terms. Modern party politics did not really begin to coalesce in Great Britain until at least 1784.
| Election | First member | First member | 1st party | Second member | Second member | 2nd party |
| The Rump Parliament recalled (1659) and the Long Parliament restored (1660) |||||||
| 1660 | | Sir Humphrey Orme | Court | | Charles Fane, Lord le Despencer | Country |
| 1666 | | Sir Humphrey Orme | Court | | Edward Palmer | Whig |
| 1667 | | Sir Humphrey Orme | Court | | William FitzWilliam, 3rd Baron FitzWilliam | Whig |
| 1671 | | Sir Vere Fane | Whig | | William FitzWilliam, 3rd Baron FitzWilliam | Whig |
| Feb. 1679 | | Francis St John | Whig | | William FitzWilliam, 3rd Baron FitzWilliam | Whig |
| Aug. 1679 | | Francis St John | Whig | | Charles Orme | Whig |
| 1681 | | Francis St John | Whig | | William FitzWilliam, 3rd Baron FitzWilliam | Whig |
| 1685 | | Charles FitzWilliam | Whig | | Charles Orme | Whig |
| Jan 1689 | | Charles FitzWilliam | Whig | | Sir Gilbert Dolben, 1st Baronet | Whig |
| Dec 1689 | | Sir William Brownlow, 4th Baronet | Whig | | Sir Gilbert Dolben, 1st Baronet | Whig |
| 1698 | | Hon. Sidney Wortley-Montagu | Whig | | Francis St John | Whig |
| 1701 | | Hon. Sidney Wortley-Montagu | Whig | | Sir Gilbert Dolben, 1st Baronet | Whig |
| 1710 | | John FitzWilliam, Viscount Milton | Whig | | Charles Parker | Tory |
| 1722 | | John FitzWilliam, Viscount Milton | Whig | | Hon. Sidney Wortley-Montagu | Whig |
| 1727 | | John FitzWilliam, Viscount Milton | Whig | | Sir Edward O'Bryan, 2nd Baronet | Tory |
| 1727 | | John FitzWilliam, Viscount Milton | Whig | | Hon. Sidney Wortley-Montagu | Whig |
| 1728 by-election | | John FitzWilliam, Viscount Milton | Whig | | Joseph Banks | Whig |
| 1729 by-election | | Charles Gounter-Nicoll | Whig | | Joseph Banks | Whig |
| Jan. 1734 by-election | | Armstead Parker | Tory | | Joseph Banks | Whig |
| April 1734 | | Armstead Parker | Tory | | Sir Edward Wortley Montagu | Whig |
| 1741 | | William FitzWilliam, 3rd Earl FitzWilliam | Whig | | Sir Edward Wortley Montagu | Whig |
| 1742 by-election | | Armstead Parker | Tory | | Sir Edward Wortley Montagu | Whig |
| 1747 | | Sir Matthew Lamb, 1st Baronet | Whig | | Sir Edward Wortley Montagu | Whig |
| 1761 | | Sir Matthew Lamb, 1st Baronet | Whig | | Armstead Parker | Tory |
| March 1768 | | Sir Matthew Lamb, 1st Baronet | Whig | | Matthew Wyldbore | Whig |
| Nov. 1768 by-election | | Henry Belasyse, Viscount Belasyse | Whig | | Matthew Wyldbore | Whig |
| 1774 by-election | | Richard Benyon | Whig | | Matthew Wyldbore | Whig |
| 1780 | | Richard Benyon | Whig | | James Farrel Phipps | Whig |
| 1786 by-election | | Richard Benyon | Whig | | Hon. Lionel Damer | Whig |
| 1796 | | Dr. French Laurence | Whig | | Hon. Lionel Damer | Whig |
| 1802 | | Dr. French Laurence | Whig | | William Elliot | Whig |
| 1809 by-election | | Francis Russell, Marquess of Tavistock | Whig | | William Elliot | Whig |
| 1812 | | George Ponsonby | Whig | | William Elliot | Whig |
| 1816 by-election | | Hon. William Lamb | Whig | | William Elliot | Whig |
| Feb. 1819 by-election | | Hon. William Lamb | Whig | | Sir James Scarlett | Whig |
| Nov. 1819 by-election | | Sir Robert Heron, 2nd Baronet | Whig | | Sir James Scarlett | Whig |
| Aug. 1830 | | Sir Robert Heron, 2nd Baronet | Whig | | Charles Wentworth-FitzWilliam, Viscount Milton | Whig |
| Nov. 1830 by-election | | Sir Robert Heron, 2nd Baronet | Whig | | John Nicholas Fazakerley | Whig |
| 1841 | | Sir Robert Heron, 2nd Baronet | Whig | | Hon. George Wentworth-FitzWilliam | Whig |
| 1847 | | Hon. William Cavendish | Whig | | Hon. George Wentworth-FitzWilliam | Whig |
| 1852 | | Hon. Richard Watson | Whig | | Hon. George Wentworth-FitzWilliam | Whig |
| 1852 by-election | | George Hammond Whalley | Radical | | Hon. George Wentworth-FitzWilliam | Whig |
| 1853 by-election | | Thomson Hankey | Whig | | Hon. George Wentworth-FitzWilliam | Whig |
| 1859 | | Thomson Hankey | Liberal | | George Hammond Whalley | Liberal |
| 1868 | | William Wells | Liberal | | George Hammond Whalley | Liberal |
| 1874 | | Thomson Hankey | Liberal | | George Hammond Whalley | Liberal |
| 1878 by-election | | Thomson Hankey | Liberal | | Hon. John Wentworth-FitzWilliam | Independent Liberal |
| 1880 | | Hampden Whalley | Liberal | | Hon. John Wentworth-FitzWilliam | Independent Liberal |
| 1883 by-election | | Sir Sydney Buxton | Liberal | | Hon. John Wentworth-FitzWilliam | Independent Liberal |
| 1885 | representation reduced to one member | representation reduced to one member | representation reduced to one member | representation reduced to one member | representation reduced to one member | representation reduced to one member |

#### MPs 1885–1918

In 1832 the Tory Party evolved into the Conservative Party and in 1859 the Whig Party evolved, with Radicals and Peelites, into the Liberal Party. In opposition to Irish home rule, the Liberal Unionists ceded from the Liberals in 1886, aligning themselves with the Conservatives. The Labour Party was later founded, as the Labour Representation Committee, in 1900.
| Election | Member | Member | Party |
| 1885 | | Hon. John Wentworth-FitzWilliam | Independent Liberal |
| 1886 | | Hon. John Wentworth-FitzWilliam | Liberal Unionist |
| 1889 by-election | | Sir Alpheus Morton | Liberal |
| 1895 | | Sir Robert Purvis | Liberal Unionist / Conservative |
| 1906 | | Sir Granville Greenwood | Liberal |
| 1918 | parliamentary borough abolished | parliamentary borough abolished | parliamentary borough abolished |

### Division and county constituency

The parliamentary borough of Peterborough was abolished under the Representation of the People Act 1918, and the name was transferred to a division of the new parliamentary county of Northampton with the Soke of Peterborough. The Peterborough division became a county constituency in 1950.

#### MPs 1918–1974

| Election | Member | Member | Party |
| 1918 | | Sir Henry Brassey, 1st Baronet | Coalition Conservative |
| 1929 | | J. F. Horrabin | Labour |
| 1931 | | David Cecil, Lord Burghley | Conservative |
| 1943 by-election | | John Hely-Hutchinson, Viscount Suirdale | Conservative |
| 1945 | | Stanley Tiffany | Labour Co-operative |
| 1950 | | Sir Harmar Nicholls | Conservative |
| Feb. 1974 | county constituency abolished | county constituency abolished | county constituency abolished |

### Borough constituency

Peterborough was redefined as a borough constituency with effect from the February 1974 general election. Successors of the historic parliamentary boroughs, the spending limits for election campaigns are slightly lower than in county constituencies.

#### MPs since 1974

| Election | Member | Party |
| Feb. 1974 | Sir Harmar Nicholls | Conservative |
| Oct. 1974 | Michael Ward | Labour |
| 1979 | Sir Brian Mawhinney | Conservative |
| 1997 | Helen Clark | Labour |
| 2005 | Stewart Jackson | Conservative |
| 2017 | Fiona Onasanya | Labour |
| 2018 | Fiona Onasanya | Independent |
| 2019 by-election | Lisa Forbes | Labour |
| 2019 | Paul Bristow | Conservative |
| 2024 | Andrew Pakes | Labour Co-op |
Onasanya sat as an independent after she was suspended by the Labour Party in December 2018. The seat became vacant on 1 May 2019 following a successful recall petition, until 7 June 2019, when Lisa Forbes was elected to the constituency in the 2019 Peterborough by-election, on behalf of the Labour Party.

## Elections
### Elections in the 2020s

General election 2024: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour Co-op | Andrew Pakes | 13,418 | 32.0 | −9.5 |
| | Conservative | Paul Bristow | 13,300 | 31.8 | −14.7 |
| | Reform UK | Sue Morris | 5,379 | 12.8 | +8.3 |
| | Workers Party | Amjad Hussain | 5,051 | 12.1 | N/A |
| | Green | Nicola Day | 2,542 | 6.1 | +4.6 |
| | Liberal Democrats | Nick Sandford | 1,746 | 4.2 | −0.7 |
| | CPA | Tom Rogers | 225 | 0.5 | +0.2 |
| | Independent | Zahid Khan | 211 | 0.5 | N/A |
| Majority | Majority | Majority | 118 | 0.2 | N/A |
| Turnout | Turnout | Turnout | 41,872 | 57.1 | –8.3 |
| Registered electors | Registered electors | Registered electors | 73,378 | | |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | 2.6 | |

### Elections in the 2010s

2019 notional result :
| Party | Party | Vote | % |
| | Conservative | 21,955 | 46.5 |
| | Labour | 19,622 | 41.5 |
| | Liberal Democrats | 2,316 | 4.9 |
| | Brexit Party | 2,102 | 4.5 |
| | Green | 713 | 1.5 |
| | Others | 524 | 1.1 |
| Turnout | Turnout | 47,232 | 65.4 |
| Electorate | Electorate | 72,273 |
General election 2019: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Paul Bristow | 22,334 | 46.7 | −0.1 |
| | Labour | Lisa Forbes | 19,754 | 41.3 | −6.8 |
| | Liberal Democrats | Beki Sellick | 2,334 | 4.9 | +1.6 |
| | Brexit Party | Mike Greene | 2,127 | 4.4 | N/A |
| | Green | Joseph Wells | 728 | 1.5 | −0.3 |
| | Independent | Luke Ferguson | 260 | 0.5 | N/A |
| | CPA | Tom Rogers | 151 | 0.3 | N/A |
| | Monster Raving Loony | The Very Raving Mr P | 113 | 0.2 | N/A |
| Majority | Majority | Majority | 2,580 | 5.4 | N/A |
| Turnout | Turnout | Turnout | 47,801 | 65.9 | −0.8 |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | +3.3 | |
By-election 2019: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Lisa Forbes | 10,484 | 30.9 | 17.2 |
| | Brexit Party | Mike Greene | 9,801 | 28.9 | New |
| | Conservative | Paul Bristow | 7,243 | 21.4 | 25.4 |
| | Liberal Democrats | Beki Sellick | 4,159 | 12.3 | 9.0 |
| | Green | Joseph Wells | 1,035 | 3.1 | 1.3 |
| | UKIP | John Whitby | 400 | 1.2 | New |
| | CPA | Tom Rogers | 162 | 0.5 | New |
| | English Democrat | Stephen Goldspink | 153 | 0.5 | New |
| | SDP | Patrick O'Flynn | 135 | 0.4 | New |
| | Monster Raving Loony | Alan Hope | 112 | 0.3 | New |
| | Independent | Andrew Moore | 101 | 0.3 | New |
| | Common Good | Dick Rodgers | 60 | 0.2 | New |
| | Renew | Peter Ward | 45 | 0.1 | New |
| | UKEU | Pierre Kirk | 25 | 0.1 | New |
| | Give Me Back Elmo | Bobby Smith | 5 | 0.0 | New |
| Majority | Majority | Majority | 683 | 2.0 | 0.7 |
| Turnout | Turnout | Turnout | 33,920 | 48.4 | 18.3 |
| | Labour hold | Labour hold | Swing | 23.6 | |
General election 2017: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Fiona Onasanya | 22,950 | 48.1 | +12.5 |
| | Conservative | Stewart Jackson | 22,343 | 46.8 | +7.1 |
| | Liberal Democrats | Beki Sellick | 1,597 | 3.3 | −0.4 |
| | Green | Fiona Radić | 848 | 1.8 | −0.8 |
| Majority | Majority | Majority | 607 | 1.3 | N/A |
| Turnout | Turnout | Turnout | 47,738 | 66.7 | +1.8 |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | +2.7 | |
General election 2015: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Stewart Jackson | 18,684 | 39.7 | −0.7 |
| | Labour | Lisa Forbes | 16,759 | 35.6 | +6.1 |
| | UKIP | Mary Herdman | 7,485 | 15.9 | +9.2 |
| | Liberal Democrats | Darren Fower | 1,774 | 3.8 | −15.8 |
| | Green | Darren Bisby-Boyd | 1,218 | 2.6 | +1.4 |
| | Liberal | Chris Ash | 639 | 1.4 | New |
| | Independent | John Fox | 516 | 1.1 | New |
| Majority | Majority | Majority | 1,925 | 4.1 | −6.8 |
| Turnout | Turnout | Turnout | 47,075 | 64.9 | +1.0 |
| | Conservative hold | Conservative hold | Swing | −3.4 | |
General election 2010: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Stewart Jackson | 18,133 | 40.4 | −2.9 |
| | Labour | Ed Murphy | 13,272 | 29.5 | −4.8 |
| | Liberal Democrats | Nick Sandford | 8,816 | 19.6 | +2.9 |
| | UKIP | Frances Fox | 3,007 | 6.7 | +3.5 |
| | English Democrat | Rob King | 770 | 1.7 | New |
| | Green | Fiona Radic | 523 | 1.2 | New |
| | Independent | John Swallow | 406 | 0.9 | New |
| Majority | Majority | Majority | 4,861 | 10.9 | +4.3 |
| Turnout | Turnout | Turnout | 44,927 | 63.9 | +2.9 |
| | Conservative hold | Conservative hold | Swing | +0.95 | |

### Elections in the 2000s

General election 2005: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Stewart Jackson | 17,364 | 42.1 | +4.1 |
| | Labour | Helen Clark | 14,624 | 35.5 | −9.6 |
| | Liberal Democrats | Nick Sandford | 6,876 | 16.7 | +2.2 |
| | UKIP | Mary Herdman | 1,242 | 3.0 | +0.6 |
| | National Front | Terry Blackham | 931 | 2.3 | New |
| | Independent | Marc Potter | 167 | 0.4 | New |
| Majority | Majority | Majority | 2,740 | 6.6 | N/A |
| Turnout | Turnout | Turnout | 41,194 | 61.0 | −0.4 |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | +6.85 | |
General election 2001: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Helen Brinton | 17,975 | 45.1 | −5.2 |
| | Conservative | Stewart Jackson | 15,121 | 38.0 | +2.8 |
| | Liberal Democrats | Nick Sandford | 5,761 | 14.5 | +3.8 |
| | UKIP | Julian Fairweather | 955 | 2.4 | +1.7 |
| Majority | Majority | Majority | 2,854 | 7.1 | −8.0 |
| Turnout | Turnout | Turnout | 39,812 | 61.4 | −11.4 |
| | Labour hold | Labour hold | Swing | −4.0 | |

### Elections in the 1990s

General election 1997: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Helen Brinton | 24,365 | 50.3 | +12.5 |
| | Conservative | Jacqueline Foster | 17,042 | 35.2 | −14.3 |
| | Liberal Democrats | David Howarth | 5,170 | 10.7 | +1.4 |
| | Referendum | Philip Slater | 924 | 1.91 | New |
| | Natural Law | Charles Brettell | 334 | 0.7 | +0.4 |
| | UKIP | John Linskey | 317 | 0.7 | New |
| | ProLife Alliance | Stephen Goldspink | 275 | 0.6 | New |
| Majority | Majority | Majority | 7,323 | 15.1 | N/A |
| Turnout | Turnout | Turnout | 48,427 | 72.8 | −2.3 |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | +11.6 | |
General election 1992: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Brian Mawhinney | 31,827 | 48.3 | −1.1 |
| | Labour | Julie Owens | 26,451 | 40.2 | +6.5 |
| | Liberal Democrats | Amanda Taylor | 5,208 | 7.9 | −8.2 |
| | Liberal | Erbie Murat | 1,557 | 2.4 | New |
| | BNP | Richard Heaton | 311 | 0.5 | New |
| | Independent | Pamela Beasley | 271 | 0.4 | New |
| | Natural Law | Charles Brettell | 215 | 0.3 | New |
| Majority | Majority | Majority | 5,376 | 8.1 | −7.6 |
| Turnout | Turnout | Turnout | 65,840 | 75.1 | +1.6 |
| | Conservative hold | Conservative hold | Swing | −3.8 | |

### Elections in the 1980s

General election 1987: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Brian Mawhinney | 30,624 | 49.4 | +2.3 |
| | Labour | Andrew MacKinlay | 20,840 | 33.7 | +4.7 |
| | Liberal | David Green | 9,984 | 16.1 | −6.6 |
| | Green | Nigel Callaghan | 506 | 0.8 | −0.1 |
| Majority | Majority | Majority | 9,784 | 15.7 | −2.4 |
| Turnout | Turnout | Turnout | 61,951 | 73.5 | +0.2 |
| | Conservative hold | Conservative hold | Swing | −1.2 | |
General election 1983: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Brian Mawhinney | 27,270 | 47.1 | −1.7 |
| | Labour | Brian Fish | 16,831 | 29.0 | −10.8 |
| | SDP | Elizabeth Walston | 13,142 | 22.7 | +12.7 |
| | Ecology | Nigel Callaghan | 511 | 0.9 | New |
| | Workers Revolutionary | DE Hyland | 155 | 0.3 | +0.1 |
| Majority | Majority | Majority | 10,439 | 18.1 | +9.1 |
| Turnout | Turnout | Turnout | 57,909 | 73.3 | −4.6 |
| | Conservative hold | Conservative hold | Swing | +4.5 | |

### Elections in the 1970s

General election 1979: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Brian Mawhinney | 27,734 | 48.80 | +8.12 |
| | Labour | Michael Ward | 22,632 | 39.82 | −4.63 |
| | Liberal | D Green | 5,685 | 10.00 | −4.87 |
| | National Front | J Willhelmy | 672 | 1.18 | New |
| | Workers Revolutionary | M Bishop | 106 | 0.19 | New |
| Majority | Majority | Majority | 5,102 | 8.98 | N/A |
| Turnout | Turnout | Turnout | 56,829 | 77.94 | +0.07 |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | +6.37 | |
General election October 1974: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Michael Ward | 21,820 | 44.45 | +4.94 |
| | Conservative | Harmar Nicholls | 19,972 | 40.68 | +1.13 |
| | Liberal | Peter Boizot | 7,302 | 14.87 | −6.06 |
| Majority | Majority | Majority | 1,848 | 3.77 | N/A |
| Turnout | Turnout | Turnout | 49,094 | 77.87 | −4.45 |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | +1.91 | |
General election February 1974: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 20,353 | 39.55 | −14.53 |
| | Labour | Michael Ward | 20,331 | 39.51 | −6.41 |
| | Liberal | Peter Boizot | 10,772 | 20.93 | New |
| Majority | Majority | Majority | 22 | 0.04 | −8.12 |
| Turnout | Turnout | Turnout | 51,456 | 82.32 | +3.83 |
| | Conservative hold | Conservative hold | Swing | −4.06 | |
General election 1970: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 30,227 | 54.08 | +8.01 |
| | Labour | Michael Ward | 25,662 | 45.92 | −0.14 |
| Majority | Majority | Majority | 4,565 | 8.16 | +8.15 |
| Turnout | Turnout | Turnout | 55,889 | 78.49 | −2.93 |
| | Conservative hold | Conservative hold | Swing | +4.08 | |

### Elections in the 1960s

General election 1966: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 23,944 | 46.07 | −0.48 |
| | Labour | Michael Ward | 23,941 | 46.06 | +4.58 |
| | Liberal | Basil Goldstone | 4,093 | 7.87 | −4.10 |
| Majority | Majority | Majority | 3 | 0.01 | −5.06 |
| Turnout | Turnout | Turnout | 51,978 | 81.42 | −0.34 |
| | Conservative hold | Conservative hold | Swing | −2.53 | |
General election 1964: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 24,045 | 46.55 | −8.01 |
| | Labour | David Saunders | 21,428 | 41.48 | −3.96 |
| | Liberal | Lawrence Young | 6,181 | 11.97 | New |
| Majority | Majority | Majority | 2,617 | 5.07 | −4.05 |
| Turnout | Turnout | Turnout | 51,654 | 81.76 | −1.23 |
| | Conservative hold | Conservative hold | Swing | −2.03 | |

### Elections in the 1950s

General election 1959: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 27,414 | 54.56 | +1.28 |
| | Labour | Betty Boothroyd | 22,830 | 45.44 | −1.28 |
| Majority | Majority | Majority | 4,584 | 9.12 | +2.56 |
| Turnout | Turnout | Turnout | 50,244 | 82.99 | −0.02 |
| | Conservative hold | Conservative hold | Swing | +1.28 | |
General election 1955: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 26,319 | 53.28 | +5.23 |
| | Labour | Albert Farrer | 23,081 | 46.72 | −0.60 |
| Majority | Majority | Majority | 3,238 | 6.56 | +5.83 |
| Turnout | Turnout | Turnout | 49,400 | 83.01 | −3.79 |
| | Conservative hold | Conservative hold | Swing | +2.92 | |
General election 1951: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 24,536 | 48.05 | +2.11 |
| | Labour | Albert Farrer | 24,163 | 47.32 | +1.67 |
| | Liberal | Wolf Isaac Akst | 2,367 | 4.64 | −3.78 |
| Majority | Majority | Majority | 373 | 0.73 | +0.44 |
| Turnout | Turnout | Turnout | 51,066 | 86.80 | −0.43 |
| | Conservative hold | Conservative hold | Swing | +0.22 | |
General election 1950: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Harmar Nicholls | 22,815 | 45.94 | −3.36 |
| | Labour Co-op | Stanley Tiffany | 22,671 | 45.65 | −5.05 |
| | Liberal | Wolf Isaac Akst | 4,180 | 8.42 | New |
| Majority | Majority | Majority | 144 | 0.29 | N/A |
| Turnout | Turnout | Turnout | 49,666 | 86.37 | +13.47 |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | +0.7 | |

### Elections in the 1940s

General election 1945: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour Co-op | Stanley Tiffany | 22,056 | 50.7 | +7.3 |
| | Conservative | John Hely-Hutchinson | 21,485 | 49.3 | −7.3 |
| Majority | Majority | Majority | 571 | 1.4 | N/A |
| Turnout | Turnout | Turnout | 43,541 | 72.9 | −7.9 |
| | Labour Co-op gain from Conservative | Labour Co-op gain from Conservative | Swing | | |
1943 Peterborough by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Hely-Hutchinson | 11,976 | 52.4 | −4.2 |
| | Independent Labour | Samuel Bennett | 10,890 | 47.6 | New |
| Majority | Majority | Majority | 1,086 | 4.8 | −8.4 |
| Turnout | Turnout | Turnout | 22,866 | | |
| | Conservative hold | Conservative hold | Swing | | |
General Election 1939–40 Another general election was required to take place before the end of 1940. The political parties had been making preparations for an election to take place from 1939 and by the end of this year, the following candidates had been selected:
* Conservative: David Cecil
* Labour: Samuel Bennett

### Elections in the 1930s

General election 1935: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Cecil | 22,677 | 56.6 | −8.6 |
| | Labour | Ernest A J Davies | 17,373 | 43.4 | +8.6 |
| Majority | Majority | Majority | 5,304 | 13.2 | −17.2 |
| Turnout | Turnout | Turnout | 40,050 | 80.8 | −4.4 |
| | Conservative hold | Conservative hold | Swing | | |
General election 1931: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Cecil | 26,640 | 65.2 | +27.5 |
| | Labour | Frank Horrabin | 14,206 | 34.8 | −4.4 |
| Majority | Majority | Majority | 12,434 | 30.4 | N/A |
| Turnout | Turnout | Turnout | 40,846 | 85.2 | +4.6 |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | | |

### Elections in the 1920s

General election 1929: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Frank Horrabin | 14,743 | 39.2 | +6.6 |
| | Unionist | Henry Brassey | 14,218 | 37.7 | −12.7 |
| | Liberal | Francis Hill | 8,704 | 23.1 | +6.1 |
| Majority | Majority | Majority | 525 | 1.5 | N/A |
| Turnout | Turnout | Turnout | 37,665 | 80.6 | +3.4 |
| Registered electors | Registered electors | Registered electors | 46,704 | | |
| | Labour gain from Unionist | Labour gain from Unionist | Swing | +9.7 | |
General election 1924: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Henry Brassey | 14,195 | 50.4 | +7.0 |
| | Labour | John Mansfield | 9,180 | 32.6 | +2.1 |
| | Liberal | Daniel Boyle | 4,786 | 17.0 | −9.1 |
| Majority | Majority | Majority | 5,015 | 17.8 | +4.9 |
| Turnout | Turnout | Turnout | 28,161 | 77.2 | +2.8 |
| Registered electors | Registered electors | Registered electors | 36,461 | | |
| | Unionist hold | Unionist hold | Swing | +2.5 | |
General election 1923: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Henry Brassey | 11,634 | 43.4 | −4.1 |
| | Labour | John Mansfield | 8,177 | 30.5 | +0.1 |
| | Liberal | Daniel Boyle | 7,014 | 26.1 | +4.0 |
| Majority | Majority | Majority | 3,457 | 12.9 | −4.2 |
| Turnout | Turnout | Turnout | 26,825 | 74.4 | −6.2 |
| Registered electors | Registered electors | Registered electors | 36,049 | | |
| | Unionist hold | Unionist hold | Swing | −2.1 | |
General election 1922: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Henry Brassey | 13,560 | 47.5 | +3.4 |
| | Labour | John Mansfield | 8,668 | 30.4 | −10.6 |
| | Liberal | George Nicholls | 6,290 | 22.1 | +7.2 |
| Majority | Majority | Majority | 4,892 | 17.1 | +14.0 |
| Turnout | Turnout | Turnout | 28,518 | 80.6 | +18.4 |
| Registered electors | Registered electors | Registered electors | 35,393 | | |
| | Unionist hold | Unionist hold | Swing | +7.0 | |

### Elections in the 1910s

General election 1918: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| C | Unionist | Henry Brassey | 9,516 | 44.1 | −3.3 |
| | Labour | John Mansfield | 8,832 | 41.0 | New |
| | Liberal | Thomas Ivatt Slater | 3,214 | 14.9 | −37.7 |
| Majority | Majority | Majority | 684 | 3.1 | N/A |
| Turnout | Turnout | Turnout | 21,562 | 62.2 | −27.8 |
| Registered electors | Registered electors | Registered electors | 34,676 | | |
| | Unionist gain from Liberal | Unionist gain from Liberal | Swing | +17.2 | |
| C indicates candidate endorsed by the coalition government. ||||||
General election December 1910: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | George Greenwood | 3,105 | 52.6 | −0.9 |
| | Conservative | Henry Lygon | 2,802 | 47.4 | +0.9 |
| Majority | Majority | Majority | 303 | 5.2 | −1.8 |
| Turnout | Turnout | Turnout | 5,907 | 90.0 | −4.2 |
| Registered electors | Registered electors | Registered electors | 6,564 | | |
| | Liberal hold | Liberal hold | Swing | −0.9 | |
General election January 1910: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | George Greenwood | 3,308 | 53.5 | −7.0 |
| | Liberal Unionist | Robert Purvis | 2,875 | 46.5 | +7.0 |
| Majority | Majority | Majority | 433 | 7.0 | −14.0 |
| Turnout | Turnout | Turnout | 6,183 | 94.2 | +3.0 |
| Registered electors | Registered electors | Registered electors | 6,564 | | |
| | Liberal hold | Liberal hold | Swing | −7.0 | |

### Elections in the 1900s

General election 1906: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | George Greenwood | 3,326 | 60.5 | +12.3 |
| | Liberal Unionist | Robert Purvis | 2,167 | 39.5 | −12.3 |
| Majority | Majority | Majority | 1,159 | 21.0 | N/A |
| Turnout | Turnout | Turnout | 5,493 | 91.2 | +6.9 |
| Registered electors | Registered electors | Registered electors | 6,025 | | |
| | Liberal gain from Liberal Unionist | Liberal gain from Liberal Unionist | Swing | +12.3 | |
General election 1900: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Unionist | Robert Purvis | 2,315 | 51.8 | −1.0 |
| | Liberal | Halley Stewart | 2,155 | 48.2 | +1.0 |
| Majority | Majority | Majority | 160 | 3.6 | −2.0 |
| Turnout | Turnout | Turnout | 4,470 | 84.3 | −5.1 |
| Registered electors | Registered electors | Registered electors | 5,300 | | |
| | Liberal Unionist hold | Liberal Unionist hold | Swing | −1.0 | |

### Elections in the 1890s

General election 1895: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Unionist | Robert Purvis | 2,259 | 52.8 | +4.8 |
| | Liberal | Alpheus Morton | 2,020 | 47.2 | −4.8 |
| Majority | Majority | Majority | 239 | 5.6 | N/A |
| Turnout | Turnout | Turnout | 4,279 | 89.4 | +3.5 |
| Registered electors | Registered electors | Registered electors | 4,787 | | |
| | Liberal Unionist gain from Liberal | Liberal Unionist gain from Liberal | Swing | +4.8 | |
General election 1892: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Alpheus Morton | 2,037 | 52.0 | +6.4 |
| | Liberal Unionist | Robert Purvis | 1,879 | 48.0 | −6.4 |
| Majority | Majority | Majority | 158 | 4.0 | N/A |
| Turnout | Turnout | Turnout | 3,916 | 85.9 | +1.7 |
| Registered electors | Registered electors | Registered electors | 4,559 | | |
| | Liberal gain from Liberal Unionist | Liberal gain from Liberal Unionist | Swing | +6.4 | |

### Elections in the 1880s

By-election, 7 Oct 1889: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Alpheus Morton | 1,893 | 53.6 | +8.0 |
| | Liberal Unionist | Robert Purvis | 1,642 | 46.4 | −8.0 |
| Majority | Majority | Majority | 251 | 7.2 | N/A |
| Turnout | Turnout | Turnout | 3,535 | 87.2 | +2.9 |
| Registered electors | Registered electors | Registered electors | 4,056 | | |
| | Liberal gain from Liberal Unionist | Liberal gain from Liberal Unionist | Swing | +8.0 | |
* Caused by Wentworth-Fitzwilliam's death.
General election 1886: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Unionist | John Wentworth-FitzWilliam | 1,780 | 54.4 | +0.7 |
| | Liberal | George Greenwood | 1,491 | 45.6 | −0.7 |
| Majority | Majority | Majority | 289 | 8.8 | +1.4 |
| Turnout | Turnout | Turnout | 3,271 | 84.3 | −4.5 |
| Registered electors | Registered electors | Registered electors | 3,882 | | |
| | Liberal Unionist gain from Independent Liberal | Liberal Unionist gain from Independent Liberal | Swing | | |
General election 1885: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Independent Liberal | John Wentworth-FitzWilliam | 1,853 | 53.7 | +19.3 |
| | Liberal | Sydney Buxton | 1,595 | 46.3 | +1.7 |
| Majority | Majority | Majority | 258 | 7.4 | −9.1 |
| Turnout | Turnout | Turnout | 3,448 | 88.8 | +19.5 (est) |
| Registered electors | Registered electors | Registered electors | 3,882 | | |
| | Independent Liberal hold | Independent Liberal hold | Swing | +8.8 | |
By-election, 23 Jun 1883: Peterborough (1 seat) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Sydney Buxton | 1,438 | 56.5 | −22.5 |
| | Conservative | John Adam Ferguson | 1,106 | 43.5 | +22.5 |
| Majority | Majority | Majority | 332 | 13.0 | +7.3 |
| Turnout | Turnout | Turnout | 2,544 | 70.9 | +1.6 (est) |
| Registered electors | Registered electors | Registered electors | 3,589 | | |
| | Liberal hold | Liberal hold | Swing | −22.5 | |
* Caused by Whalley's resignation.
General election 1880: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Independent Liberal | John Wentworth-FitzWilliam | 1,615 | 34.4 | N/A |
| | Liberal | Hampden Whalley | 1,257 | 26.7 | −7.4 |
| | Conservative | Robert Tennant | 987 | 21.0 | +3.8 |
| | Liberal | Thomson Hankey | 841 | 17.9 | −16.2 |
| Turnout | Turnout | Turnout | 2,350 (est) | 69.3 (est) | −4.8 |
| Registered electors | Registered electors | Registered electors | 3,393 | | |
| Majority | Majority | Majority | 774 | 16.5 | N/A |
| | Independent Liberal gain from Liberal | Independent Liberal gain from Liberal | Swing | | |
| Majority | Majority | Majority | 270 | 5.7 | −5.7 |
| | Liberal hold | Liberal hold | Swing | | |

### Elections in the 1870s

By-election, 29 Oct 1878: Peterborough (1 seat) :
| Party | Party | Candidate | Votes | % | ±% |
| | Independent Liberal | John Wentworth-FitzWilliam | 1,360 | 50.5 | New |
| | Conservative | John Lawrance | 671 | 24.9 | +7.7 |
| | Liberal | James Hayes Raper | 653 | 24.3 | −43.9 |
| | Lib-Lab | George Potter | 8 | 0.3 | −14.3 |
| Majority | Majority | Majority | 689 | 25.6 | N/A |
| Turnout | Turnout | Turnout | 2,692 | 80.6 | +6.5 |
| Registered electors | Registered electors | Registered electors | 3,340 | | |
| | Independent Liberal gain from Liberal | Independent Liberal gain from Liberal | Swing | N/A | |
* Caused by Whalley's death. Raper was a 'Permissive Bill' candidate.
General election 1874: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Thomson Hankey | 1,135 | 29.4 | +6.3 |
| | Liberal | George Hammond Whalley | 1,105 | 28.6 | −2.5 |
| | Conservative | Henry Wrenfordsley | 666 | 17.2 | +12.6 |
| | Lib-Lab | George Potter | 562 | 14.6 | N/A |
| | Liberal | Neville Goodman | 323 | 8.4 | N/A |
| | Liberal | Robert Malcolm Kerr | 71 | 1.8 | N/A |
| Majority | Majority | Majority | 439 | 11.4 | +3.4 |
| Turnout | Turnout | Turnout | 2,264 (est) | 74.1 (est) | −2.6 |
| Registered electors | Registered electors | Registered electors | 3,056 | | |
| | Liberal hold | Liberal hold | Swing | +0.0 | |
| | Liberal hold | Liberal hold | Swing | −4.4 | |

### Elections in the 1860s

General election 1868: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | William Wells | 1,282 | 35.5 | +3.7 |
| | Liberal | George Hammond Whalley | 1,122 | 31.1 | −4.2 |
| | Liberal | Thomson Hankey | 834 | 23.1 | −10.5 |
| | Liberal | William Green | 204 | 5.7 | N/A |
| | Conservative | Henry Wrenfordsley | 167 | 4.6 | New |
| Majority | Majority | Majority | 288 | 8.0 | +6.2 |
| Turnout | Turnout | Turnout | 1,888 (est) | 76.7 (est) | +1.6 |
| Registered electors | Registered electors | Registered electors | 2,461 | | |
| | Liberal hold | Liberal hold | Swing | | |
| | Liberal hold | Liberal hold | Swing | | |
* Green, a Radical liberal, withdrew before polling.
General election 1865: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | George Hammond Whalley | 340 | 35.3 | +7.5 |
| | Liberal | Thomson Hankey | 320 | 33.6 | +3.4 |
| | Liberal | William Wells | 303 | 31.8 | N/A |
| Majority | Majority | Majority | 17 | 1.8 | −4.6 |
| Turnout | Turnout | Turnout | 482 (est) | 75.1 (est) | −5.0 |
| Registered electors | Registered electors | Registered electors | 641 | | |
| | Liberal hold | Liberal hold | Swing | N/A | |
| | Liberal hold | Liberal hold | Swing | N/A | |

### Elections in the 1850s

General election 1859: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Thomson Hankey | 275 | 30.2 | −4.4 |
| | Liberal | George Hammond Whalley | 253 | 27.8 | +4.2 |
| | Conservative | John Harvey Lee Wingfield | 195 | 21.4 | New |
| | Liberal | James Wilde | 187 | 20.5 | N/A |
| Majority | Majority | Majority | 58 | 6.4 | −4.6 |
| Turnout | Turnout | Turnout | 455 (est) | 80.1 (est) | +9.3 |
| Registered electors | Registered electors | Registered electors | 568 | | |
| | Liberal hold | Liberal hold | Swing | | |
| | Liberal hold | Liberal hold | Swing | | |
General election 1857: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Wentworth-FitzWilliam | 321 | 41.8 | +4.6 |
| | Whig | Thomson Hankey | 266 | 34.6 | +1.8 |
| | Radical | George Hammond Whalley | 181 | 23.6 | N/A |
| Majority | Majority | Majority | 85 | 11.0 | +8.2 |
| Turnout | Turnout | Turnout | 384 (est) | 70.8 (est) | −16.9 |
| Registered electors | Registered electors | Registered electors | 542 | | |
| | Whig hold | Whig hold | Swing | | |
| | Whig hold | Whig hold | Swing | | |
By-election, 25 June 1853: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Radical | George Hammond Whalley | 236 | 52.3 | +0.6 |
| | Whig | Thomson Hankey | 215 | 47.7 | −0.6 |
| Majority | Majority | Majority | 21 | 4.6 | +1.2 |
| Turnout | Turnout | Turnout | 451 | 85.7 | 0.0 |
| Registered electors | Registered electors | Registered electors | 526 | | |
| | Radical hold | Radical hold | Swing | +0.6 | |
* Caused by the 1852 by-election being declared void on petition due to bribery and treating. Although Whalley secured the most votes, his election was declared void owing to disqualification due to the earlier bribery and treating, and Hankey was declared elected.
By-election, 6 December 1852: Peterborough :
| Party | Party | Candidate | Votes | % | ±% |
| | Radical | George Hammond Whalley | 233 | 51.7 | N/A |
| | Whig | George Cornewall Lewis | 218 | 48.3 | −21.7 |
| Majority | Majority | Majority | 15 | 3.4 | N/A |
| Turnout | Turnout | Turnout | 451 | 85.7 | −2.0 |
| Registered electors | Registered electors | Registered electors | 526 | | |
| | Radical gain from Whig | Radical gain from Whig | Swing | | |
* Caused by Watson's death.
General election 1852: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Wentworth-FitzWilliam | 260 | 37.2 | N/A |
| | Whig | Richard Watson | 229 | 32.8 | N/A |
| | Conservative | John Talbot Clifton | 210 | 30.0 | New |
| Majority | Majority | Majority | 19 | 2.8 | N/A |
| Turnout | Turnout | Turnout | 455 (est) | 87.7 (est) | N/A |
| Registered electors | Registered electors | Registered electors | 518 | | |
| | Whig hold | Whig hold | Swing | N/A | |
| | Whig hold | Whig hold | Swing | N/A | |

### Elections in the 1840s

General election 1847: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Wentworth-FitzWilliam | Unopposed | Unopposed | Unopposed |
| | Whig | William Cavendish | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 553 | | |
| | Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| | Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
General election 1841: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Wentworth-FitzWilliam | 317 | 38.8 | +1.5 |
| | Whig | Robert Heron | 255 | 31.3 | −3.3 |
| | Conservative | Thomas Gladstone | 244 | 29.9 | +1.8 |
| Majority | Majority | Majority | 11 | 1.4 | −5.1 |
| Turnout | Turnout | Turnout | 495 | 85.9 | −3.6 |
| Registered electors | Registered electors | Registered electors | 576 | | |
| | Whig hold | Whig hold | Swing | +0.3 | |
| | Whig hold | Whig hold | Swing | −2.1 | |

### Elections in the 1830s

General election 1837: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | John Nicholas Fazakerley | 311 | 37.3 | −1.9 |
| | Whig | Robert Heron | 288 | 34.6 | +0.5 |
| | Conservative | William Edward Surtees | 234 | 28.1 | +1.4 |
| Majority | Majority | Majority | 54 | 6.5 | −0.9 |
| Turnout | Turnout | Turnout | 494 | 89.5 | +3.2 |
| Registered electors | Registered electors | Registered electors | 552 | | |
| | Whig hold | Whig hold | Swing | −1.3 | |
| | Whig hold | Whig hold | Swing | −0.1 | |
General election 1835: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % |
| | Whig | John Nicholas Fazakerley | 412 | 39.2 |
| | Whig | Robert Heron | 358 | 34.1 |
| | Conservative | Walker Ferrand | 281 | 26.7 |
| Majority | Majority | Majority | 77 | 7.4 |
| Turnout | Turnout | Turnout | 591 | 86.3 |
| Registered electors | Registered electors | Registered electors | 685 | |
| | Whig hold | Whig hold | Whig hold | Whig hold |
| | Whig hold | Whig hold | Whig hold | Whig hold |
General election 1832: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % |
| | Whig | John Nicholas Fazakerley | Unopposed | Unopposed |
| | Whig | Robert Heron | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 773 | |
| | Whig hold | Whig hold | Whig hold | Whig hold |
| | Whig hold | Whig hold | Whig hold | Whig hold |
General election 1831: Peterborough (2 seats) :
| Party | Party | Candidate | Votes | % |
| | Whig | John Nicholas Fazakerley | Unopposed | Unopposed |
| | Whig | Robert Heron | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | c. 730 | |
| | Whig hold | Whig hold | Whig hold | Whig hold |
| | Whig hold | Whig hold | Whig hold | Whig hold |
By-election, 24 November 1830: Peterborough :
| Party | Party | Candidate | Votes | % |
| | Whig | John Nicholas Fazakerley | Unopposed | Unopposed |
| | Whig hold | Whig hold | Whig hold | Whig hold |
* Caused by Wentworth-FitzWilliam's resignation
General election 1830: Peterborough (2 seats) :
| Party | Candidate | Votes | % |
| Whig | Charles Wentworth-Fitzwilliam | Unopposed | Unopposed |
| Whig | Robert Heron | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold |
| Whig hold | Whig hold | Whig hold | Whig hold |