# Middlesex (UK Parliament constituency)

Middlesex was a constituency of the House of Commons of the Parliament of England, then of the Parliament of Great Britain from 1707 to 1800, then of the Parliament of the United Kingdom from 1801 until abolished in 1885. It returned two members per election by various voting systems including hustings.

## Boundaries and boundary changes

This county constituency until 1832 covered all the historic county of Middlesex, in south-eastern England, comprising Spelthorne, Poyle, South Mimms and Potters Bar in other modern counties, together with the north, west, and north-west sectors of the present-day Greater London. Apart from the ability of some voters to participate in the borough franchises of the cities of London and Westminster (after dates of their inception, see top right or below), it gave rise to three more urban offshoot divisions in 1832, one of which was split in two at the next national review or reform, in 1868. Its southern boundary was the River Thames.
The county seat returned two Members of Parliament (sometimes referred to by the medieval term of knights of the shire). The place of election for the county was until 1700 at Hampstead Heath, thereafter at The Butts in the town centre of Brentford. Hustings were typically over a period of a fortnight when candidates set out their stall, and visible bribery had become not uncommon in closer contests around the country in such larger seats at the time, inspiring William Hogarth’s series of four pictures titled ‘Four Prints of An Election’ (when printed).
Until 1832 the county franchise was limited to forty shilling freeholders. The decrease in the value of money due to inflation and the expansion of the wealth and population as the urbanised area in the east around London and Westminster grew contributed to gradually expanding the electorate. The county was estimated by Henning to have about 1,660 voters in 1681. Sedgwick estimated about 3,000 in the 1715–54 period. Namier and Brook suggested there were about 3,500 in 1754–90. The number had reached about 6,000 by 1790–1820, according to Thorne. Close elections between popular candidates would therefore be expensive - the worth of being a local magistrate, major landowner or other dignitary carrying little weight among such a generally urban and numerous upper-middle class forming the bulk of the electorate.
For subsequent changes in the franchise see Reform Act 1832 and Reform Act 1867. From 1832 voters were registered; the size of the electorate is shown below.
The geographic county until 1885 also contained the borough constituencies of City of London (first recorded as having its extraordinary four members from 1298) and Westminster (enfranchised with two members from 1545). In 1832 three two-seat Boroughs were added (or enfranchised): Finsbury, Marylebone, and Tower Hamlets. In 1867 two new parliamentary boroughs each returning two MPs were constituted: 'Hackney' (St. Leonard's, Shoreditch, St Matthew's Bethnal Green and St John's Hackney) formerly represented in borough elections via Tower Hamlets and 'Chelsea' (parishes of Chelsea, Kensington, Hammersmith and Fulham). The single-member non-territorial University constituency of London University (1868–1950) was somewhat connected to the county by having most of its graduates eligible to vote.
Possession of a county electoral qualification, deriving from owning various types of property or having ecclesiastical 'offices' (controversially and sporadically defined) in an area not otherwise represented, conferred the right to vote in the county elections.
An 1885 redistribution of seats saw Middlesex and its early breakaway seats in and around the City reformed under the Redistribution of Seats Act 1885 reflecting the wider electorate of the Reform Act 1884 and need to 'liberate' boroughs, i.e. urban areas without properly apportioned representation:
* Constituencies in the urban south-east part that returned 18 MPs were replaced by 38 single-member seats.
* the City of London constituency (loosely considered with the county) was reduced from 4 to 2 members.
* the Middlesex constituency latterly covering the north, west and south-west of the county returning 2 MPs was replaced by 7 single-member seats.

### Local government bodies

In 1889 the 40 urban constituencies that comprised the south-eastern part fell into (for local government) a County of London save for the much smaller City of London which remained a separate quasi-county and legal jurisdiction. The seven county divisions (constituencies) in the north and west of the historic county came under a new local government body, the administrative county of Middlesex. Both counties were also known by their governing bodies' name, County Councils (abbreviated to LCC and MCC). The seven successor seats were Brentford, Ealing, Enfield, Harrow, Hornsey, Tottenham and Uxbridge. These (and numerous later successor seats) had MCC local governance until its abolition in 1965.

## Members of Parliament

Preliminary note: The English civil year started on Lady Day, 25 March, until 1752 (Scotland having changed to 1 January in 1600). The year used in the lists of Parliaments in this article have been converted to the new style where necessary. Old style dates for days between 1 January and 24 March actually referred to days after 31 December. No attempt has been made to compensate for the eleven days which did not occur in September 1752 in both England and Scotland as well as other British controlled territories (when the day after 2 September was 14 September), so as to bring the British Empire fully in line with the Gregorian calendar.
Constituency created (1265): See Montfort's Parliament for further details. Knights of the shire are known to have been summoned to most Parliaments from 1290 (19th Parliament of King Edward I of England) and to every one from 1320 (19th Parliament of King Edward II of England).

### Knights of the shire 1265–1660

Some of the members elected during this period have been identified, but this list does not include Parliaments where no member has been identified before the reign of King Henry VIII. In the list (as opposed to the table below) the year given is for the first meeting of the Parliament, with the month added where there was more than one Parliament in the year. If a second year is given this is a date of dissolution. Early Parliaments usually only existed for a few days or weeks, so dissolutions in the same year as the first meeting are not recorded in this list If a specific date of election is known this is recorded in italic brackets. The Roman numerals in brackets, following some names, are those used to distinguish different politicians of the same name in 'The House of Commons' 1509-1558 and 1558–1603.
In this period, Parliament was not an institution with a regular pattern of elections and sittings. Therefore, a separate entry is made for each Parliament, even if the same Knight of the Shire served in successive Parliaments.
List of known Knights of the Shire before 1509
| Parliament | First member | Second member |
| 1295 (Nov) | William de Brook | Stephen de Gravesend |
| 1296 | Richard de Wyndesor | Richard le Rous |
| 1297 (Oct) | Richard le Rous | ? |
| 1298 (Mar) | Richard le Rous | ? |
| 1298 (May) | Richard le Rous | ? |
| 1300 | Richard le Rous | ? |
| 1301 | Richard le Rous | ? |
| 1302 (Oct) | Richard le Rous | ? |
| 1305 (Feb) | Richard le Rous | ? |
| 1306 | Richard le Rous | ? |
| 1386 | Sir Adam Francis | William Swanland |
| 1388 (Feb) | Sir Adam Francis | William Swanland |
| 1388 (Sep) | William Barnville | Godfrey Atte Perry |
| 1390 (Jan) | John Shorditch I | Thomas Coningsby |
| 1390 (Nov) | John Shorditch I | Sir Adam Francis |
| 1391 | Thomas Bray | William Norton |
| 1393 | William Tamworth | Thomas Maidstone |
| 1394 | John Shorditch II | James Ormesby |
| 1395 | John Shorditch II | Thomas Coningsby |
| 1397 (Jan) | Thomas Goodlake | Thomas Maidstone |
| 1397 (Sep) | Sir Adam Francis | Sir John Wroth |
| 1399 | John Durham | Thomas Maidstone |
| 1401 | William Loveney | Sir John Wroth |
| 1402 | James Northampton | Thomas Coningsby |
| 1404 (Jan) | William Wroth | Sir John Wroth |
| 1404 (Oct) | Sir Roger Strange | William Powe |
| 1406 | Henry Somer | Sir John Wroth |
| 1407 | Henry Somer | William Loveney |
| 1410 | |
| 1411 | Sir Adam Francis | Sir Roger Strange |
| 1413 (Feb) | |
| 1413 (May) | William Loveney | Richard Wyot |
| 1414 (Apr) | Simon Camp | Walter Green |
| 1414 (Nov) | Thomas Charlton | John Walden |
| 1415 | Simon Camp | Thomas Coningsby |
| 1416 (Mar) | |
| 1416 (Oct) | Henry Somer | Walter Gawtron |
| 1419 | Thomas Frowyk | Thomas Coningsby |
| 1420 | Sir John Boys | Walter Green |
| 1421 (May) | Henry Somer | Sir Thomas Charlton |
| 1421 (Dec) | Richard Maidstone | Edmund Bibbesworth |
| 1429 | Henry Somer |
| 1442 | Thomas Charlton | John Somerset |
| 1447 | Thomas Charlton |
| 1449 | Thomas Charlton |
| 1453 | Thomas Charlton |
| 1459 | Sir Thomas Charlton |
| 1460 | Sir Thomas Charlton |
| 1491 | Sir Thomas Lovell |
Table of Knights of the Shire 1509-1660
| Summoned | Elected | Assembled | Dissolved | First Member | Second Member |
| 17 October 1509 | 1509–10 | 21 January 1510 | 23 February 1510 | Sir Thomas Lovell (I) | unknown |
| 28 November 1511 | 1511–12 | 4 February 1512 | 4 March 1514 | unknown | unknown |
| 23 November 1514 | 1514–15 | 5 February 1515 | 22 December 1515 | unknown | unknown |
| unknown | 1523 | 15 April 1523 | 13 August 1523 | Sir Thomas More (I) $^a$ | unknown |
| 9 August 1529 | 1529 | 3 November 1529 | 14 April 1536 | Robert Wroth $^b$ | Richard Hawkes $^c$ |
| 27 April 1536 | 1536 | 8 June 1536 | 18 July 1536 | unknown | unknown |
| 1 March 1539 | 1539 | 28 April 1539 | 24 July 1540 | Sir Ralph Sadler | Robert Cheeseman |
| 23 November 1541 | 1541–42 | 16 January 1542 | 28 March 1544 | Robert Cheeseman | John Hughes $^d$ |
| 1 December 1544 | 1544–45 | 23 November 1545 | 31 January 1547 | Sir William Paget | Thomas Wroth |
| 2 August 1547 | 1547 | 4 November 1547 | 15 April 1552 | Sir Thomas Wroth | John Newdigate |
| 5 January 1553 | 1553 | 1 March 1553 | 31 March 1553 | Sir Robert Bowes | Sir Thomas Wroth |
| 14 August 1553 | 1553 | 5 October 1553 | 5 December 1553 | Sir Edward Hastings | John Newdigate |
| 17 February 1554 | 1554 | 2 April 1554 | 3 May 1554 | Sir Edward Hastings | John Newdigate |
| 3 October 1554 | 1554 | 12 November 1554 | 16 January 1555 | Sir Edward Hastings | Sir Roger Cholmley |
| 3 September 1555 | 1555 | 21 October 1555 | 9 December 1555 | Sir Edward Hastings | Sir Roger Cholmley |
| 6 December 1557 | 1557–58 | 20 January 1558 | 17 November 1558 | Sir Roger Cholmley | John Newdigate |
| 5 December 1558 | 29 December 1558 | 23 January 1559 | 8 May 1559 | Sir Roger Cholmley | Sir Thomas Wroth |
| 10 November 1562 | 1562–63 | 11 January 1563 | 2 January 1567 | Sir William Cordell | Sir Thomas Wroth |
| unknown | 1571 | 2 April 1571 | 29 May 1571 | Francis Newdigate | John Newdigate |
| 28 March 1572 | 1572 | 8 May 1572 | 19 April 1583 | Robert Wroth (I) | Sir Owen Hopton |
| 12 October 1584 | 1584 | 23 November 1584 | 14 September 1585 | Robert Wroth (I) | Sir Owen Hopton |
| 15 September 1586 | 1586 | 15 October 1586 | 23 March 1587 | Robert Wroth (I) | William Fleetwood (III) |
| 18 September 1588 | 19 December 1588 | 4 February 1589 | 29 March 1589 | Robert Wroth (I) | William Fleetwood (III) |
| 4 January 1593 | 1593 | 18 February 1593 | 10 April 1593 | Robert Wroth (I) | Francis Bacon |
| 23 August 1597 | 15 September 1597 | 24 October 1597 | 9 February 1598 | Sir Robert Wroth (I) | Sir John Peyton (I) |
| 11 September 1601 | 8 October 1601 | 27 October 1601 | 19 December 1601 | Sir John Fortescue (I) | Sir Robert Wroth (I) |
| 31 January 1604 | 1604 | 19 March 1604 | 9 February 1611 | Sir William Fleetwood | Sir Robert Wroth |
| unknown | 1614 | 5 April 1614 | 7 June 1614 | Sir Julius Caesar | Sir Thomas Lake |
| 13 November 1620 | 1620–21 | 16 January 1621 | 8 February 1622 | Sir Francis Darcy | Sir Gilbert Gerard, Bt |
| 20 December 1623 | 1623–24 | 12 February 1624 | 27 March 1625 | Sir Gilbert Gerard, Bt | Sir John Suckling |
| 2 April 1625 | 1625 | 17 May 1625 | 12 August 1625 | Sir John Francklyn | Sir Gilbert Gerard, Bt |
| 20 December 1625 | 1626 | 6 February 1626 | 15 June 1626 | Sir Gilbert Gerard, Bt | Sir Edward Spencer |
| 31 January 1628 | 1628 | 17 March 1628 | 10 March 1629 | Sir Francis Darcy | Sir Henry Spiller |
| 1629–1640 | No Parliaments summoned | No Parliaments summoned | No Parliaments summoned | No Parliaments summoned | No Parliaments summoned |
| 20 February 1640 | 1640 | 13 April 1640 | 5 May 1640 | Sir John Francklyn | Sir Gilbert Gerard, Bt |
| 24 September 1640 | 1640 | 3 November 1640 | 16 March 1660 $^e$ | Sir John Francklyn $^f$ | Sir Gilbert Gerard, Bt $^g$ |
| 24 September 1640 | 18 May 1648 | 3 November 1640 | 16 March 1660 $^e$ | Sir Edward Spencer $^h$ | Sir Gilbert Gerard, Bt $^g$ |
Notes:-
* $^a$ Speaker of the House of Commons.
* $^b$ Wroth ceased to be an MP after 11 May 1535. It is unknown if there was a by-election.
* $^c$ Hawkes ceased to be MP by May/June 1532. It is unknown if there was a by-election.
* $^d$ Hughes ceased to be an MP after January/April 1543. It is unknown if there was a by-election.
* $^e$ In theory the Long Parliament existed throughout the 1640–1660 term, as it could not be lawfully dissolved without its own consent which was not given until 1660. In practice all or part of the membership of the House of Commons were not permitted to sit for lengthy periods. Other bodies considered to be Parliaments existed within parts of the term of the Long Parliament.
* $^f$ Francklyn died and a by-election was held.
* $^g$ In December 1648, Gilbert was excluded from Parliament in Pride's Purge and the seat was left vacant.
* $^h$ Spencer is not recorded as having sat after Pride's Purge in December 1648.
Table of Members of the Commonwealth Parliaments 1653-1659
The county had three nominated members in the Barebones Parliament, four representatives in the First and Second and the usual two in the Third of the Protectorate Parliaments
| Summoned | Elected | Assembled | Dissolved | First member | Second member | Third member | Fourth member |
| | | 4 July 1653 | 12 December 1653 | Sir William Roberts | Augustine Wingfield | Arthur Squib | |
| 1 June 1654 | 1654 | 3 September 1654 | 22 January 1655 | Sir James Harrington, Bt | Sir William Roberts | Josiah Berners | Edmund Harvey |
| 10 July 1656 | 1656 | 17 September 1656 | 4 February 1658 | Sir John Barkstead | Sir William Roberts | Chaloner Chute | William Kiffen |
| 9 December 1658 | 1658–59 | 27 January 1659 | 22 April 1659 | Francis Gerard | Chaloner Chute | | |

### Knights of the shire 1660–1885

| Year | 1st Member | 1st Member | 1st Party | 2nd Member | 2nd Member | 2nd Party |
| 1660 | | Sir Lancelot Lake | Non Partisan | | Sir William Waller | Non Partisan |
| 1661 | | Sir Lancelot Lake | Non Partisan | | Sir Thomas Allen | Non Partisan |
| 1679 | | Sir Robert Peyton | Non Partisan | | Sir William Roberts, Bt | Non Partisan |
| 1681 | | Robert Atkyns | Non Partisan | | Sir William Roberts, Bt | Non Partisan |
| 1681 | | Nicholas Raynton | Non Partisan | | Sir William Roberts, Bt | Non Partisan |
| 1685 | | Sir Charles Gerard, Bt | Non Partisan | | Ralph Hawtrey | Non Partisan |
| 1695 | | Edward Russell | Non Partisan | | Sir John Wolstenholme, Bt | Non Partisan |
| 1696 | | Sir John Bucknall | Non Partisan | | Sir John Wolstenholme, Bt | Non Partisan |
| 1698 | | Warwick Lake | Non Partisan | | Sir John Wolstenholme, Bt | Non Partisan |
| 1701 | | Warwick Lake | Non Partisan | | Hugh Smithson | Tory |
| 1701 | | Warwick Lake | Non Partisan | | John Austen | Whig |
| 1702 | | Warwick Lake | Non Partisan | | Hugh Smithson | Tory |
| 1705 | | Scorie Barker | Non Partisan | | Sir John Wolstenholme, Bt | Non Partisan |
| 1709 | | Scorie Barker | Non Partisan | | John Austen | Whig |
| 1710 | | Hon. James Bertie | Tory | | Hugh Smithson | Tory |
| 1722 | | Hon. James Bertie | Tory | | Sir John Austen, Bt. | Whig |
| 1727 | | Hon. James Bertie | Tory | | Sir Francis Child | Tory |
| 1734 | | William Pulteney | Whig | | Sir Francis Child | Tory |
| 1740 | | William Pulteney | Whig | | Sir Hugh Smithson, Bt (later Sir Hugh Percy, Bt) $^a$ | Tory |
| 1742 | | Sir Roger Newdigate, Bt | Tory | | Sir Hugh Smithson, Bt (later Sir Hugh Percy, Bt) $^a$ | Tory |
| 1747 | | Sir William Beauchamp-Proctor, Bt | Whig | | Sir Hugh Smithson, Bt (later Sir Hugh Percy, Bt) $^a$ | Whig |
| 1750 | | Sir William Beauchamp-Proctor, Bt | Whig | | George Cooke | Tory |
| 1768 | | John Wilkes | Radical | | George Cooke | Tory |
| 1768 | | John Wilkes | Radical | | John Glynn | Whig |
| 1769 (Feb) | | John Wilkes | Radical | | John Glynn | Whig |
| 1769 (Mar) | | John Wilkes | Radical | | John Glynn | Whig |
| 1769 (Apr) | | Henry Luttrell | Tory | | John Glynn | Whig |
| 1774 | | John Wilkes | Radical | | John Glynn | Whig |
| 1779 | | John Wilkes | Radical | | Thomas Wood | Whig |
| 1780 | | John Wilkes | Radical | | George Byng | Whig |
| 1784 | | John Wilkes | Radical | | William Mainwaring | Tory |
| 1790 | | George Byng | Whig | | William Mainwaring | Tory |
| 1802 | | George Byng | Whig | | Sir Francis Burdett, Bt | Whig |
| 1804 | | George Byng | Whig | | George Boulton Mainwaring | Tory |
| 1805 | | George Byng | Whig | | Sir Francis Burdett, Bt | Whig |
| 1806 | | George Byng | Whig | | George Boulton Mainwaring | Tory |
| 1806 | | George Byng | Whig | | William Mellish | Tory |
| 1820 | | George Byng | Whig | | Samuel Charles Whitbread | Whig |
| 1830 | | George Byng | Whig | | Joseph Hume | Radical |
| 1837 | | George Byng | Whig | | Thomas Wood | Conservative |
| 1847 | | Lord Robert Grosvenor | Whig | | Thomas Wood | Conservative |
| 1847 | | Lord Robert Grosvenor | Whig | | Ralph Bernal Osborne | Radical |
| 1857 | | Lord Robert Grosvenor | Whig | | Robert Culling Hanbury | Whig |
| 1857 | | Hon. George Byng (later Viscount Enfield) $^b$ | Whig | | Robert Culling Hanbury | Whig |
| 1859 | | Hon. George Byng (later Viscount Enfield) $^b$ | Liberal | | Robert Culling Hanbury | Liberal |
| 1867 | | Hon. George Byng (later Viscount Enfield) $^b$ | Liberal | | Henry Labouchère | Liberal |
| 1868 | | Hon. George Byng (later Viscount Enfield) $^b$ | Liberal | | Lord George Hamilton | Conservative |
| 1874 | | Octavius Coope | Conservative | | Lord George Hamilton | Conservative |
| 1885 | constituency divided and abolished | constituency divided and abolished | constituency divided and abolished | constituency divided and abolished | constituency divided and abolished | constituency divided and abolished |
Notes:-
* $^a$ Smithson, not the same man as the former member of the same name, changed his surname to Percy before the 1741 general election.
* $^b$ Byng received the courtesy title of Viscount Enfield in 1860.
* Leigh Rayment's Historical List of MPs – Constituencies beginning with "M" (part 2)

## Elections
### General notes

In multi-member elections the bloc voting system was used. Voters could cast a vote for two candidates or "plump" for one, as they chose. The leading candidates with the largest number of votes were elected.
In by-elections, to fill a single seat, the first past the post system applied.

   #### Table terms
   #### Sources

    Results of 1660-1790 are by History of Parliament Trust publications. The results from 1790–1832 are by Stooks Smith, thereafter his work becoming the footnotes for results by Craig.

### Results 1660–1885
#### Parliament of England

General election 5 April 1660: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | Lancelot Lake | Elected | N/A | N/A |
| Nonpartisan | William Waller | Elected | N/A | N/A |
| Nonpartisan | Gilbert Gerard | Defeated | N/A | N/A |
| Nonpartisan | William Roberts | Defeated | N/A | N/A |
| Nonpartisan | James Harington | Defeated | N/A | N/A |
| Nonpartisan | John Page | Defeated | N/A | N/A |
* Note (1660) vote totals unavailable
General election 4 April 1661: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | Lancelot Lake | Elected | N/A | N/A |
| Nonpartisan | Thomas Allen | Elected | N/A | N/A |
| Nonpartisan | John Robinson | Defeated | N/A | N/A |
* Note (1661) vote totals unavailable
General Election 21 February 1679: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Robert Peyton | Unopposed | N/A | N/A |
| | Nonpartisan | William Roberts | Unopposed | N/A | N/A |
* Note (1679): Roberts was not the same man as the 1660 candidate of the same name.
General Election 3 September 1679: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | William Roberts | 720 | 45.37 | N/A |
| Nonpartisan | Robert Peyton | 670 | 42.22 | N/A |
| Nonpartisan | Francis Gerard | 194 | 12.22 | N/A |
| Nonpartisan | William Smyth | 3 | 0.19 | N/A |
* Note (1679): Smyth is referred to as Smith in House of Commons 1660-1690, but Smyth seems to be correct from Leigh Rayment's list of baronets.
* Expulsion from the House of Peyton
By-Election 13 January 1681: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Robert Atkyns | 680 | 55.78 | +55.78 |
| | Nonpartisan | Hugh Middleton | 379 | 31.09 | +31.09 |
| | Nonpartisan | Charles Umfrevile | 160 | 13.13 | +13.13 |
| Majority | Majority | Majority | 301 | 24.69 | N/A |
| | Nonpartisan hold | Nonpartisan hold | Swing | N/A | |
General election 3 March 1681: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | William Roberts | 1,054 | 35.73 | +35.73 |
| Nonpartisan | Nicholas Raynton | 874 | 29.63 | +29.63 |
| Nonpartisan | Hugh Middleton | 607 | 20.58 | −10.51 |
| Nonpartisan | Charles Gerard | 415 | 14.07 | +14.07 |
General election 18 March 1685: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | Charles Gerard | Elected | N/A | N/A |
| Nonpartisan | Roger Hawtrey | Elected | N/A | N/A |
| Nonpartisan | Hugh Middleton | Defeated | N/A | N/A |
| Nonpartisan | Nicholas Raynton | Defeated | N/A | N/A |
| Nonpartisan | Thomas Johnson | Defeated | N/A | N/A |
| Nonpartisan | William Smyth | Defeated | N/A | N/A |
* Note (1685) vote totals unavailable. Smyth is referred to as Smith in House of Commons 1660-1690, but Smyth seems to be correct from Leigh Rayment's list of baronets.
General election 11 January 1689: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Nonpartisan | Charles Gerard | Elected | N/A | N/A |
| Nonpartisan | Roger Hawtrey | Elected | N/A | N/A |
| Nonpartisan | Robert Peyton | Defeated | N/A | N/A |
| Nonpartisan | Thomas Johnson | Defeated | N/A | N/A |
* Note (1689) vote totals unavailable
General election 1690: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Charles Gerard | Unopposed | N/A | N/A |
| | Nonpartisan | Roger Hawtrey | Unopposed | N/A | N/A |
General election 14 November 1695: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Edward Russell | Unopposed | N/A | N/A |
| | Nonpartisan | John Wolstenholme | Unopposed | N/A | N/A |
* Choice of Russell to sit for Cambridgeshire
By-Election 8 January 1696: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | John Bucknall | Unopposed | N/A | N/A |
| | Nonpartisan hold | Nonpartisan hold | Swing | N/A | |
General election 4 August 1698: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Warwick Lake | Unopposed | N/A | N/A |
| | Nonpartisan | John Wolstenholme | Unopposed | N/A | N/A |
General Election 16 January 1701: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Warwick Lake | Unopposed | N/A | N/A |
| | Tory | Hugh Smithson | Unopposed | N/A | N/A |
General Election 3 December 1701: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Warwick Lake | Unopposed | N/A | N/A |
| | Whig | John Austen | Unopposed | N/A | N/A |
General election 30 July 1702: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Warwick Lake | Unopposed | N/A | N/A |
| | Tory | Hugh Smithson | Unopposed | N/A | N/A |
General election 28 May 1705: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Scorie Barker | Unopposed | N/A | N/A |
| | Nonpartisan | John Wolstenholme | Unopposed | N/A | N/A |

#### Parliament of Great Britain

General election 1708: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Nonpartisan | Scorie Barker | Unopposed | N/A | N/A |
| | Nonpartisan | John Wolstenholme | Unopposed | N/A | N/A |
* Death of Wolstenholme
By-Election 3 March 1709: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | John Austen | Unopposed | N/A | N/A |
| | Whig gain from Nonpartisan | Whig gain from Nonpartisan | Swing | N/A | |
General election 12 October 1710: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | James Bertie | Unopposed | N/A | N/A |
| | Tory | Hugh Smithson | Unopposed | N/A | N/A |
General election 1713: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | James Bertie | Unopposed | N/A | N/A |
| | Tory | Hugh Smithson | Unopposed | N/A | N/A |
General election 27 January 1715: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Tory | James Bertie | 1,604 | 27.60 | N/A |
| Tory | Hugh Smithson | 1,553 | 26.72 | N/A |
| Whig | John Austen | 1,330 | 22.80 | N/A |
| Whig | Henry Barker | 1,325 | 22.80 | N/A |
General election 30 March 1722: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Tory | James Bertie | 1,800 | 39.43 | +11.83 |
| Whig | John Austen | 967 | 21.18 | −1.62 |
| Whig | Henry Barker | 908 | 18.89 | −3.91 |
| Tory | George Cooke | 662 | 14.50 | +14.50 |
| Tory | William Withers | 228 | 5.00 | +5.00 |
General election 6 September 1727: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Tory | James Bertie | 1,410 | 29.21 | −10.22 |
| Tory | Francis Child | 1,305 | 27.03 | +27.03 |
| Whig | Henry Barker | 1,074 | 22.25 | +3.36 |
| Whig | Lord Paget | 1,039 | 21.52 | +21.52 |
General election 25 April 1734: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | Francis Child | Unopposed | N/A | N/A |
| | Whig | William Pulteney | Unopposed | N/A | N/A |
* Death of Child
By-Election 15 March 1740: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | Hugh Smithson | 382 | 72.21 | N/A |
| | Whig | Henry Barker | 147 | 27.79 | N/A |
| Majority | Majority | Majority | 235 | 44.42 | N/A |
| | Tory hold | Tory hold | Swing | N/A | |
* Smithson (not the same person as the former MP of the same name) subsequently changed his surname to Percy
General election 14 May 1741: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | William Pulteney | Unopposed | N/A | N/A |
| | Tory | Hugh Percy | Unopposed | N/A | N/A |
* Creation of Pulteney as 1st Earl of Bath
By-Election 5 August 1742: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | Roger Newdigate | Unopposed | N/A | N/A |
| | Tory gain from Whig | Tory gain from Whig | Swing | N/A | |
General election 2 July 1747: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Whig | Hugh Percy | 1,797 | 36.33 | N/A |
| Whig | William Beauchamp-Proctor | 1,457 | 29.45 | N/A |
| Tory | George Cooke | 899 | 18.17 | N/A |
| Tory | Roger Newdigate | 794 | 16.05 | N/A |
* Succession of Percy as 2nd Earl of Northumberland
By-Election 8 March 1750: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | George Cooke | 1,617 | 57.38 | +39.21 |
| | Whig | Fraser Honywood | 1,201 | 42.62 | +42.62 |
| Majority | Majority | Majority | 416 | 14.76 | N/A |
| | Tory gain from Whig | Tory gain from Whig | Swing | N/A | |
General election 2 May 1754: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | George Cooke | Unopposed | N/A | N/A |
| | Whig | William Beauchamp-Proctor | Unopposed | N/A | N/A |
General election 7 April 1761: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | George Cooke | Unopposed | N/A | N/A |
| | Whig | William Beauchamp-Proctor | Unopposed | N/A | N/A |
* Appointment of Cooke as Joint Paymaster of the Forces
By-Election 27 November 1766: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | George Cooke | Unopposed | N/A | N/A |
| | Tory hold | Tory hold | Swing | N/A | |
General election 28 March 1768: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Radical | John Wilkes | 1,297 | 44.33 | N/A |
| Tory | George Cooke | 827 | 28.26 | N/A |
| Whig | William Beauchamp-Proctor | 802 | 27.41 | N/A |
* Note (1768): Stooks Smith attributes 1,292 votes to Wilkes. Stooks Smith does not give candidates party labels in Middlesex until after this election.
* Death of Cooke
By-Election 14 December 1768: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | John Glynn | 1,548 | 54.89 | +54.89 |
| | Tory | William Beauchamp-Proctor | 1,272 | 45.11 | +17.70 |
| Majority | Majority | Majority | 276 | 9.79 | N/A |
| | Whig gain from Tory | Whig gain from Tory | Swing | N/A | |
* Note (1768): Poll 6 days (Source: Stooks Smith)
* Expulsion from the House of Wilkes, declared incapable of being elected 3 February 1769
By-Election 16 February 1769: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Radical | John Wilkes | Unopposed | N/A | N/A |
| | Radical hold | Radical hold | Swing | N/A | |
* Expulsion from the House of Wilkes, election declared void
By-Election 16 March 1769: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Radical | John Wilkes | Unopposed | N/A | N/A |
| | Radical hold | Radical hold | Swing | N/A | |
* Expulsion from the House of Wilkes, election declared void 17 March 1769
By-Election 13 April 1769: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Radical | John Wilkes | 1,143 | 79.16 | N/A |
| | Tory | Henry Luttrell | 296 | 20.50 | N/A |
| | Whig | William Whitaker | 5 | 0.35 | N/A |
| Majority | Majority | Majority | 847 | 58.66 | N/A |
| | Radical hold | Radical hold | Swing | N/A | |
* Election return of Wilkes amended to Luttrell by Parliament on 14 April 1769 and Luttrell seated as the MP 15 April 1769
General election 20 October 1774: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | John Glynn | Unopposed | N/A | N/A |
| | Radical | John Wilkes | Unopposed | N/A | N/A |
* Death of Glynn
By-Election 28 October 1779: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | Thomas Wood | Unopposed | N/A | N/A |
| | Whig hold | Whig hold | Swing | N/A | |
General election 14 September 1780: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | Unopposed | N/A | N/A |
| | Radical | John Wilkes | Unopposed | N/A | N/A |
General election 22 April 1784: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Tory | William Mainwaring | 2,118 | 36.72 | N/A |
| Radical | John Wilkes | 1,858 | 32.21 | N/A |
| Whig | George Byng | 1,792 | 31.07 | N/A |
General election 28 June 1790: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | Unopposed | N/A | N/A |
| | Tory | William Mainwaring | Unopposed | N/A | N/A |
* Note (1790): The George Byng who contested Middlesex elections from this year is a different person from the one who stood previously
General election 3 June 1796: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | Unopposed | N/A | N/A |
| | Tory | William Mainwaring | Unopposed | N/A | N/A |

#### Parliament of the United Kingdom

General election 13 July 1802: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | 3,848 | 38.5 | N/A |
| | Radical | Francis Burdett | 3,207 | 32.1 | N/A |
| | Tory | William Mainwaring | 2,936 | 29.4 | N/A |
| Majority | Majority | Majority | 269 | 2.7 | N/A |
| Turnout | Turnout | Turnout | 9,991 | | |
| | Radical gain from Tory | Radical gain from Tory | Swing | | |
| | Whig hold | Whig hold | Swing | | |
* Note (1802): Poll 15 days (Source: Stooks Smith)
* Election of Burdett declared void 9 July 1804
By-Election 23 July 1804: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | George Boulton Mainwaring | 2,828 | 50.0 | +20.6 |
| | Radical | Francis Burdett | 2,823 | 50.0 | +17.9 |
| Majority | Majority | Majority | 5 | 0.0 | N/A |
| Turnout | Turnout | Turnout | 5,651 | | |
| | Tory gain from Radical | Tory gain from Radical | Swing | | |
* Note (1804): Poll 15 days (Source: Stooks Smith)
* Election of Mainwaring challenged by a petition of Burdett. Mainwaring unseated and Francis Burdett seated on 5 March 1805. (Source: The Times (of London), edition of 6 March 1805)
* Election of Burdett challenged by a petition of Mainwaring. Burdett unseated and George Boulton Mainwaring seated with effect from 10 February 1806. (Source: The Times (of London), edition of 10 February 1806)
General election 10 November 1806: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | William Mellish | 3,213 | 47.9 | +18.5 |
| | Whig | George Byng | 2,304 | 34.3 | −4.2 |
| | Radical | Francis Burdett | 1,197 | 17.8 | −18.3 |
| Majority | Majority | Majority | 1,107 | 16.5 | N/A |
| Turnout | Turnout | Turnout | 6,714 | | |
| | Whig gain from Radical | Whig gain from Radical | Swing | | |
| | Tory hold | Tory hold | Swing | | |
* Note (1806): Poll 15 days (Source: Stooks Smith)
General election 18 May 1807: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Tory | William Mellish | 2,706 | 42.8 | −5.1 |
| | Whig | George Byng | 2,368 | 37.4 | +3.1 |
| | Tory | Sir Christopher Baynes, 1st Baronet | 1,252 | 19.8 | +19.8 |
| Majority | Majority | Majority | 116 | 18.6 | +2.1 |
| Turnout | Turnout | Turnout | 6,326 | | |
| | Tory hold | Tory hold | Swing | | |
| | Whig hold | Whig hold | Swing | | |
General election 12 October 1812: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Whig | George Byng | Unopposed | Unopposed | Unopposed |
| Tory | William Mellish | Unopposed | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| Tory hold | Tory hold | Tory hold | Tory hold | Tory hold |
General election 26 June 1818: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Whig | George Byng | Unopposed | Unopposed | Unopposed |
| Tory | William Mellish | Unopposed | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| Tory hold | Tory hold | Tory hold | Tory hold | Tory hold |
General election 17 March 1820: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | 4,004 | 37.6 | N/A |
| | Whig | Samuel Charles Whitbread | 3,585 | 33.6 | N/A |
| | Tory | William Mellish | 3,073 | 28.8 | N/A |
| Majority | Majority | Majority | 512 | 4.8 | N/A |
| Turnout | Turnout | Turnout | 10,662 | | |
| | Whig gain from Tory | Whig gain from Tory | Swing | | |
| | Whig hold | Whig hold | Swing | | |
* Note (1820): Poll 12 days (Source: Stooks Smith)
General election 1826: Middlesex (2 seats) :
| Party | Candidate | Votes | % | ±% |
| Whig | George Byng | Unopposed | Unopposed | Unopposed |
| Whig | Samuel Charles Whitbread | Unopposed | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
General election 5 August 1830: Middlesex (2 seats) :
| Party | Candidate | Votes | % |
| Whig | George Byng | Unopposed | Unopposed |
| Radical | Joseph Hume | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold |
| Radical gain from Whig | Radical gain from Whig | Radical gain from Whig | Radical gain from Whig |
General election 1831: Middlesex (2 seats) :
| Party | Candidate | Votes | % |
| Whig | George Byng | Unopposed | Unopposed |
| Radical | Joseph Hume | Unopposed | Unopposed |
| Whig hold | Whig hold | Whig hold | Whig hold |
| Radical hold | Radical hold | Radical hold | Radical hold |
General election 1832: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % |
| | Radical | Joseph Hume | 3,238 | 36.9 |
| | Whig | George Byng | 3,033 | 34.6 |
| | Tory | Charles Forbes | 1,494 | 17.0 |
| | Radical | John Scott Lillie | 1,004 | 11.4 |
| Turnout | Turnout | Turnout | 5,132 | 74.0 |
| Registered electors | Registered electors | Registered electors | 6,939 | |
| Majority | Majority | Majority | 205 | 2.3 |
| | Radical hold | Radical hold | Radical hold | Radical hold |
| Majority | Majority | Majority | 1,539 | 17.6 |
| | Whig hold | Whig hold | Whig hold | Whig hold |
General election 1835: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | 3,505 | 37.7 | +3.1 |
| | Radical | Joseph Hume | 3,096 | 33.3 | −15.0 |
| | Conservative | Thomas Wood | 2,707 | 29.1 | +12.1 |
| Turnout | Turnout | Turnout | 6,046 | 75.5 | +1.5 |
| Registered electors | Registered electors | Registered electors | 8,005 | | |
| Majority | Majority | Majority | 409 | 4.4 | −13.2 |
| | Whig hold | Whig hold | Swing | +5.3 | |
| Majority | Majority | Majority | 389 | 4.2 | +1.9 |
| | Radical hold | Radical hold | Swing | −13.6 | |
* Note (1835): The Thomas Wood who contested Middlesex elections from this year is a different person from the one who was elected in 1779
General election 31 July 1837: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | 4,796 | 26.6 | −11.1 |
| | Conservative | Thomas Wood | 4,582 | 25.4 | +10.9 |
| | Radical | Joseph Hume | 4,380 | 24.3 | −9.0 |
| | Conservative | Henry Pownall | 4,273 | 23.7 | +9.2 |
| Turnout | Turnout | Turnout | 9,260 | 72.2 | −3.3 |
| Registered electors | Registered electors | Registered electors | 12,817 | | |
| Majority | Majority | Majority | 214 | 1.2 | −3.2 |
| | Whig hold | Whig hold | Swing | −10.6 | |
| Majority | Majority | Majority | 202 | 1.1 | N/A |
| | Conservative gain from Radical | Conservative gain from Radical | Swing | +7.7 | |
General election 1841: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | Unopposed | Unopposed | Unopposed |
| | Conservative | Thomas Wood | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 13,915 | | |
| | Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| | Conservative hold | Conservative hold | Conservative hold | Conservative hold | Conservative hold |
Byng's death caused a by-election.
By-election, 3 February 1847: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | Robert Grosvenor | Unopposed | Unopposed | Unopposed |
| | Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
| Registered electors | Registered electors | Registered electors | 12,577 | | |
12577
General election 4 August 1847: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | Robert Grosvenor | 4,944 | 39.3 | N/A |
| | Radical | Ralph Bernal Osborne | 4,175 | 33.2 | N/A |
| | Conservative | Thomas Wood | 3,458 | 27.5 | N/A |
| Turnout | Turnout | Turnout | 6,289 (est) | 45.6 (est) | N/A |
| Registered electors | Registered electors | Registered electors | 13,781 | | |
| Majority | Majority | Majority | 769 | 6.1 | N/A |
| | Whig hold | Whig hold | Swing | N/A | |
| Majority | Majority | Majority | 717 | 5.7 | N/A |
| | Radical gain from Conservative | Radical gain from Conservative | Swing | N/A | |
General election 1852: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | Robert Grosvenor | 5,241 | 37.7 | −1.6 |
| | Radical | Ralph Bernal Osborne | 4,390 | 31.6 | −1.6 |
| | Conservative | John Spencer-Churchill | 4,258 | 30.7 | +3.2 |
| Turnout | Turnout | Turnout | 6,945 (est) | 47.5 (est) | +1.9 |
| Registered electors | Registered electors | Registered electors | 14,610 | | |
| Majority | Majority | Majority | 851 | 6.1 | — |
| | Whig hold | Whig hold | Swing | −1.6 | |
| Majority | Majority | Majority | 132 | 0.9 | −4.8 |
| | Radical hold | Radical hold | Swing | −1.6 | |
General election 29 April 1857: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | Robert Culling Hanbury | 5,426 | 39.7 | +8.1 |
| | Whig | Robert Grosvenor | 5,327 | 38.9 | +1.2 |
| | Conservative | Henry Cadogan | 2,928 | 21.4 | −9.3 |
| Majority | Majority | Majority | 2,399 | 17.5 | +11.4 |
| Turnout | Turnout | Turnout | 8,305 (est) | 55.4 (est) | +7.9 |
| Registered electors | Registered electors | Registered electors | 14,977 | | |
| | Whig hold | Whig hold | Swing | +6.4 | |
| | Whig gain from Radical | Whig gain from Radical | Swing | +2.9 | |
* Creation of Grosvenor as 1st Baron Ebury
By-election, 3 September 1857: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Whig | George Byng | Unopposed | Unopposed | Unopposed |
| | Whig hold | Whig hold | Whig hold | Whig hold | Whig hold |
General election 1859: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Robert Culling Hanbury | 3,678 | 43.6 | +3.9 |
| | Liberal | George Byng | 3,618 | 42.9 | +4.0 |
| | Conservative | James Haig | 1,147 | 13.6 | −7.8 |
| Majority | Majority | Majority | 2,471 | 29.3 | +11.8 |
| Turnout | Turnout | Turnout | 4,795 (est) | 31.6 (est) | −23.8 |
| Registered electors | Registered electors | Registered electors | 15,171 | | |
| | Liberal hold | Liberal hold | Swing | +3.9 | |
| | Liberal hold | Liberal hold | Swing | +4.0 | |
* Byng became known by the courtesy title of Viscount Enfield when his father became 2nd Earl of Strafford in 1860
General election 1865: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | George Byng | Unopposed | Unopposed | Unopposed |
| | Liberal | Robert Culling Hanbury | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 14,847 | | |
| | Liberal hold | Liberal hold | Liberal hold | Liberal hold | Liberal hold |
| | Liberal hold | Liberal hold | Liberal hold | Liberal hold | Liberal hold |
* Death of Hanbury
By-election 15 April 1867: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal | Henry Labouchere | Unopposed | Unopposed | Unopposed |
| | Liberal hold | Liberal hold | Liberal hold | Liberal hold | Liberal hold |
General election 21 November 1868: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | George Hamilton | 7,850 | 37.9 | New |
| | Liberal | George Byng | 6,487 | 31.3 | N/A |
| | Liberal | Henry Labouchere | 6,397 | 30.9 | N/A |
| Majority | Majority | Majority | 1,453 | 7.0 | N/A |
| Turnout | Turnout | Turnout | 14,292 (est) | 56.7 (est) | N/A |
| Registered electors | Registered electors | Registered electors | 25,196 | | |
| | Conservative gain from Liberal | Conservative gain from Liberal | Swing | N/A | |
| | Liberal hold | Liberal hold | Swing | N/A | |
General election 14 February 1874: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | George Hamilton | 10,343 | 33.3 | +14.3 |
| | Conservative | Octavius Coope | 9,867 | 31.8 | +12.8 |
| | Liberal | George Byng | 5,623 | 18.1 | −13.2 |
| | Liberal | Frederick Lehmann | 5,192 | 16.7 | −14.2 |
| Majority | Majority | Majority | 4,244 | 13.7 | N/A |
| Turnout | Turnout | Turnout | 15,513 (est) | 61.9 (est) | +5.2 |
| Registered electors | Registered electors | Registered electors | 25,071 | | |
| | Conservative hold | Conservative hold | Swing | +14.0 | |
| | Conservative gain from Liberal | Conservative gain from Liberal | Swing | +13.3 | |
* Appointment of Hamilton as Vice-President of the Privy Council Committee on Education
By-election, 12 April 1878: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | George Hamilton | Unopposed | Unopposed | Unopposed |
| | Conservative hold | Conservative hold | Conservative hold | Conservative hold | Conservative hold |
General election 1880: Middlesex (2 seats) :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | George Hamilton | 12,904 | 37.8 | +4.5 |
| | Conservative | Octavius Coope | 12,328 | 36.1 | +4.3 |
| | Liberal | Herbert Gladstone | 8,876 | 26.0 | −8.8 |
| Majority | Majority | Majority | 3,452 | 10.1 | −3.6 |
| Turnout | Turnout | Turnout | 21,492 (est) | 70.0 (est) | +8.1 |
| Registered electors | Registered electors | Registered electors | 30,707 | | |
| | Conservative hold | Conservative hold | Swing | +4.5 | |
| | Conservative hold | Conservative hold | Swing | +4.4 | |
* Appointment of Hamilton as First Lord of the Admiralty
By-election, 3 July 1885: Middlesex :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | George Hamilton | Unopposed | Unopposed | Unopposed |
| | Conservative hold | Conservative hold | Conservative hold | Conservative hold | Conservative hold |
* Constituency divided in the 1885 redistribution