# Rhein-Sieg-Kreis I

Rhein-Sieg-Kreis I is an electoral constituency (German: Wahlkreis) represented in the Bundestag. It elects one member via first-past-the-post voting. Under the current constituency numbering system, it is designated as constituency 96. It is located in southwestern North Rhine-Westphalia, comprising the eastern part of the Rhein-Sieg-Kreis district.
Rhein-Sieg-Kreis I was created for the inaugural 1949 federal election. Since 2002, it has been represented by Elisabeth Winkelmeier-Becker of the Christian Democratic Union (CDU).

## Geography

Rhein-Sieg-Kreis I is located in southwestern North Rhine-Westphalia. As of the 2021 federal election, it comprises the municipalities of Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck from the Rhein-Sieg-Kreis district.

## History

Rhein-Sieg-Kreis I was created in 1949, then known as Siegkreis. In the 1965 and 1969 elections, it was named Siegkreis I – Bonn-Land. It acquired its current name in the 1972 election. In the 1949 election, it was North Rhine-Westphalia constituency 11 in the numbering system. From 1953 through 1961, it was number 70. From 1965 through 1998, it was number 64. From 2002 through 2009, it was number 98. In the 2013 through 2021 elections, it was number 97. From the 2025 election, it has been number 96.
Originally, the constituency was coterminous with the Siegkreis district. In the 1965 through 1976 elections, it comprised the district of Landkreis Bonn as well as the modern municipalities of Bad Honnef, Königswinter, Niederkassel, Troisdorf, and Sankt Augustin from the Siegkreis district. It acquired its current borders in the 1980 election.
| Election | No. | Name | Borders |
| 1949 | 11 | Siegkreis | Siegkreis district |
| 1953 | 70 | Siegkreis | Siegkreis district |
| 1957 | 70 | Siegkreis | Siegkreis district |
| 1961 | 70 | Siegkreis | Siegkreis district |
| 1965 | 64 | Siegkreis I – Bonn-Land | Landkreis Bonn district Siegkreis district (only Bad Honnef, Königswinter, Niederkassel, Troisdorf, and Sankt Augustin municipalities) |
| 1969 | 64 | Siegkreis I – Bonn-Land | Landkreis Bonn district Siegkreis district (only Bad Honnef, Königswinter, Niederkassel, Troisdorf, and Sankt Augustin municipalities) |
| 1972 | 64 | Siegkreis I – Bonn-Land | Landkreis Bonn district Siegkreis district (only Bad Honnef, Königswinter, Niederkassel, Troisdorf, and Sankt Augustin municipalities) |
| 1976 | 64 | Siegkreis I – Bonn-Land | Landkreis Bonn district Siegkreis district (only Bad Honnef, Königswinter, Niederkassel, Troisdorf, and Sankt Augustin municipalities) |
| 1980 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 1983 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 1987 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 1990 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 1994 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 1998 | 64 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2002 | 98 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2005 | 98 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2009 | 98 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2013 | 97 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2017 | 97 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2021 | 97 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |
| 2025 | 96 | Rhein-Sieg-Kreis I | Rhein-Sieg-Kreis district (only Eitorf, Hennef (Sieg), Lohmar, Much, Neunkirchen-Seelscheid, Niederkassel, Ruppichteroth, Siegburg, Troisdorf, and Windeck municipalities) |

## Members

The constituency has been held by the Christian Democratic Union (CDU) during all but two Bundestag terms since its creation in 1949. It was first represented by Peter Etzenbach of the CDU from 1949 to 1961, followed by Georg Kliesing under 1976. Franz Möller served a single term from 1976 to 1980, being succeeded by Adolf Herkenrath. Andreas Krautscheid was elected in 1994 and served a single term. The Social Democratic Party (SPD) won the constituency in 1998, and Uwe Göllner served as representative. The CDU regained it in 2005 with candidate Elisabeth Winkelmeier-Becker. She was re-elected in 2009, 2013, 2017, 2021 and 2025.
| Election | Member | Party | % |
| 1949 | Peter Etzenbach | CDU | 37.2 |
| 1953 | Peter Etzenbach | CDU | 64.8 |
| 1957 | Peter Etzenbach | CDU | 65.4 |
| 1961 | Georg Kliesing | CDU | 59.1 |
| 1965 | Georg Kliesing | CDU | 61.8 |
| 1969 | Georg Kliesing | CDU | 54.8 |
| 1972 | Georg Kliesing | CDU | 52.6 |
| 1976 | Franz Möller | CDU | 55.6 |
| 1980 | Adolf Herkenrath | CDU | 46.6 |
| 1983 | Adolf Herkenrath | CDU | 54.8 |
| 1987 | Adolf Herkenrath | CDU | 49.6 |
| 1990 | Adolf Herkenrath | CDU | 46.0 |
| 1994 | Andreas Krautscheid | CDU | 45.8 |
| 1998 | Uwe Göllner | SPD | 44.6 |
| 2002 | Uwe Göllner | SPD | 44.2 |
| 2005 | Elisabeth Winkelmeier-Becker | CDU | 45.5 |
| 2009 | Elisabeth Winkelmeier-Becker | CDU | 44.9 |
| 2013 | Elisabeth Winkelmeier-Becker | CDU | 49.6 |
| 2017 | Elisabeth Winkelmeier-Becker | CDU | 44.3 |
| 2021 | Elisabeth Winkelmeier-Becker | CDU | 32.6 |
| 2025 | Elisabeth Winkelmeier-Becker | CDU | 35.6 |

## Election results
### 2025 election

Federal election (2025): Rhein-Sieg-Kreis I :
| Notes: | Notes: | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. |
| Party | Party | Candidate | Candidate | Votes | % | ±% | Party votes | % | ±% |
| | CDU | Y Elisabeth Winkelmeier-Becker | Y Elisabeth Winkelmeier-Becker | 70,350 | 35.6 | 3.0 | 63,340 | 31.9 | 4.4 |
| | SPD | Sebastian Hartmann | Sebastian Hartmann | 44,274 | 22.4 | 6.1 | 35,512 | 17.9 | 8.6 |
| | AfD | Tobias Ebenberger | Tobias Ebenberger | 34,562 | 17.5 | 10.5 | 34,457 | 17.4 | 10.1 |
| | Greens | Rebecca Stümper | Rebecca Stümper | 22,218 | 11.2 | 2.8 | 24,764 | 12.5 | 3.2 |
| | Left | Jason Osterhagen | Jason Osterhagen | 11,330 | 5.7 | 2.4 | 13,448 | 6.8 | 3.4 |
| | BSW | | | | | | 8,457 | 4.3 | |
| | FDP | Niko Gräfrath | Niko Gräfrath | 8,438 | 4.3 | 4.6 | 9.897 | 5.0 | 7.4 |
| | FW | Martin Wunshock | Martin Wunshock | 3,318 | 1.7 | 0.6 | 1,251 | 0.6 | 0.1 |
| | Volt | Marcel Landsberg | Marcel Landsberg | 3,101 | 1.6 | 1.0 | 1,712 | 0.9 | 0.4 |
| | Tierschutzpartei | | | | | | 2,598 | 1.3 | 0.3 |
| | PARTEI | | | | | 2.1 | 1,089 | 0.5 | 0.6 |
| | dieBasis | | | | | 1.6 | 510 | 0.3 | 1.1 |
| | PdF | | | | | | 367 | 0.2 | 0.2 |
| | Team Todenhöfer | | | | | | 347 | 0.2 | 0.3 |
| | BD | | | | | | 270 | 0.1 | |
| | Values | | | | | | 146 | 0.1 | |
| | MERA25 | | | | | | 66 | 0.0 | |
| | MLPD | | | | | | 43 | 0.0 | 0.0 |
| | Pirates | | | | | | | | 0.4 |
| | Gesundheitsforschung | | | | | | | | 0.1 |
| | Bündnis C | | | | | | | | 0.1 |
| | ÖDP | | | | | | | | 0.1 |
| | Humanists | | | | | | | | 0.1 |
| | SGP | | | | | | | 0.0 | 0.0 |
| Informal votes | Informal votes | Informal votes | Informal votes | 1,772 | | | 1,089 | | |
| Total valid votes | Total valid votes | Total valid votes | Total valid votes | 197,591 | | | 198,274 | | |
| Turnout | Turnout | Turnout | Turnout | 199,363 | 83.7 | 4.8 | | | |
| | CDU hold | CDU hold | Majority | 26,076 | 13.2 | | | | |

### 2021 election

Federal election (2021): Rhein-Sieg-Kreis I :
| Notes: | Notes: | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. |
| Party | Party | Candidate | Candidate | Votes | % | ±% | Party votes | % | ±% |
| | CDU | Y Elisabeth Winkelmeier-Becker | Y Elisabeth Winkelmeier-Becker | 60,776 | 32.6 | 11.7 | 51,474 | 27.6 | 6.6 |
| | SPD | Sebastian Hartmann | Sebastian Hartmann | 53,213 | 28.5 | 0.9 | 49,529 | 26.5 | 4.1 |
| | Greens | Lisa Anschütz | Lisa Anschütz | 26,270 | 14.1 | 7.6 | 29,305 | 15.7 | 8.2 |
| | FDP | Ralph Lorenz | Ralph Lorenz | 16,604 | 8.9 | 1.5 | 23,122 | 12.4 | 2.5 |
| | AfD | Hans Günter Eifler | Hans Günter Eifler | 13,045 | 7.0 | | 13,604 | 7.3 | 2.7 |
| | Left | Alexander Neu | Alexander Neu | 6,242 | 3.3 | 4.8 | 6,353 | 3.4 | 3.7 |
| | Tierschutzpartei | | | | | | 3,021 | 1.6 | 0.8 |
| | PARTEI | Andreas Langel | Andreas Langel | 3,828 | 2.1 | | 2,067 | 1.1 | 0.2 |
| | dieBasis | Ellen Hölzer | Ellen Hölzer | 2,951 | 1.6 | | 2,583 | 1.4 | |
| | FW | Andreas Irion | Andreas Irion | 1,929 | 1.0 | | 1,392 | 0.7 | 0.5 |
| | Team Todenhöfer | | | | | | 921 | 0.5 | |
| | Volt | Christian Sontag | Christian Sontag | 1,006 | 0.5 | | 921 | 0.5 | |
| | Pirates | | | | | | 804 | 0.4 | 0.0 |
| | Volksabstimmung | Helmut Fleck | Helmut Fleck | 602 | 0.3 | 2.7 | | | |
| | LIEBE | | | | | | 278 | 0.1 | |
| | Gesundheitsforschung | | | | | | 223 | 0.1 | 0.0 |
| | Bündnis C | | | | | | 220 | 0.1 | |
| | NPD | | | | | | 164 | 0.1 | 0.1 |
| | ÖDP | | | | | | 156 | 0.1 | 0.0 |
| | Humanists | | | | | | 153 | 0.1 | 0.0 |
| | LfK | | | | | | 154 | 0.1 | |
| | V-Partei3 | | | | | | 134 | 0.1 | 0.0 |
| | du. | | | | | | 87 | 0.0 | |
| | PdF | | | | | | 52 | 0.0 | |
| | LKR | | | | | | 46 | 0.0 | |
| | SGP | | | | | | 23 | 0.0 | 0.0 |
| | MLPD | | | | | | 19 | 0.0 | 0.0 |
| | DKP | | | | | | 19 | 0.0 | 0.0 |
| Informal votes | Informal votes | Informal votes | Informal votes | 1,751 | | | 1,393 | | |
| Total valid votes | Total valid votes | Total valid votes | Total valid votes | 186,466 | | | 186,824 | | |
| Turnout | Turnout | Turnout | Turnout | 188,217 | 78.9 | 1.2 | | | |
| | CDU hold | CDU hold | Majority | 7,563 | 4.1 | 12.6 | | | |

### 2017 election

Federal election (2017): Rhein-Sieg-Kreis I :
| Notes: | Notes: | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. |
| Party | Party | Candidate | Candidate | Votes | % | ±% | Party votes | % | ±% |
| | CDU | Y Elisabeth Winkelmeier-Becker | Y Elisabeth Winkelmeier-Becker | 79,987 | 44.3 | 5.3 | 62,334 | 34.1 | 9.3 |
| | SPD | Sebastian Hartmann | Sebastian Hartmann | 49,988 | 27.7 | 1.8 | 40,922 | 22.4 | 4.6 |
| | FDP | Ralph Lorenz | Ralph Lorenz | 18,768 | 10.4 | 7.9 | 27,267 | 14.9 | 8.6 |
| | AfD | | | | | | 18,237 | 10.0 | 5.6 |
| | Left | Alexander Neu | Alexander Neu | 14,684 | 8.1 | 3.5 | 13,038 | 7.1 | 1.6 |
| | Greens | Elisabeth Anschütz | Elisabeth Anschütz | 11,762 | 6.5 | 0.1 | 13,757 | 7.5 | 0.7 |
| | PARTEI | | | | | | 1,610 | 0.9 | 0.5 |
| | Tierschutzpartei | | | | | | 1,538 | 0.8 | |
| | Pirates | | | | | | 771 | 0.4 | 1.8 |
| | Volksabstimmung | Helmut Fleck | Helmut Fleck | 5,374 | 3.0 | 2.3 | 630 | 0.3 | 0.1 |
| | FW | | | | | | 509 | 0.3 | 0.0 |
| | AD-DEMOKRATEN | | | | | | 374 | 0.2 | |
| | NPD | | | | | | 300 | 0.2 | 0.7 |
| | DiB | | | | | | 237 | 0.1 | |
| | ÖDP | | | | | | 233 | 0.1 | 0.0 |
| | BGE | | | | | | 211 | 0.1 | |
| | V-Partei³ | | | | | | 206 | 0.1 | |
| | Gesundheitsforschung | | | | | | 181 | 0.1 | |
| | DM | | | | | | 178 | 0.1 | |
| | Die Humanisten | | | | | | 123 | 0.1 | |
| | MLPD | | | | | | 73 | 0.0 | 0.0 |
| | DKP | | | | | | 18 | 0.0 | |
| | SGP | | | | | | 10 | 0.0 | 0.0 |
| Informal votes | Informal votes | Informal votes | Informal votes | 3,732 | | | 1,538 | | |
| Total valid votes | Total valid votes | Total valid votes | Total valid votes | 180,563 | | | 182,757 | | |
| Turnout | Turnout | Turnout | Turnout | 184,295 | 77.6 | 4.0 | | | |
| | CDU hold | CDU hold | Majority | 29,999 | 16.6 | 3.5 | | | |

### 2013 election

Federal election (2013): Rhein-Sieg-Kreis I :
| Notes: | Notes: | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. |
| Party | Party | Candidate | Candidate | Votes | % | ±% | Party votes | % | ±% |
| | CDU | Y Elisabeth Winkelmeier-Becker | Y Elisabeth Winkelmeier-Becker | 84,556 | 49.6 | 4.8 | 74,187 | 43.4 | 8.0 |
| | SPD | Sebastian Hartmann | Sebastian Hartmann | 50,271 | 29.5 | 3.7 | 46,065 | 27.0 | 4.0 |
| | Greens | Robert Wendt | Robert Wendt | 10,895 | 6.4 | 1.9 | 14,000 | 8.2 | 2.3 |
| | Left | Alexander Neu | Alexander Neu | 7,946 | 4.7 | 1.7 | 9,496 | 5.6 | 1.5 |
| | AfD | Hans-Josef Frings | Hans-Josef Frings | 5,519 | 3.2 | | 7,514 | 4.4 | |
| | FDP | Jürgen Peter | Jürgen Peter | 4,172 | 2.4 | 8.9 | 10,796 | 6.3 | 12.7 |
| | Pirates | Martin Zieroth | Martin Zieroth | 3,472 | 2.0 | | 3,771 | 2.2 | 0.5 |
| | NPD | Hans Hermann Maria Rochel | Hans Hermann Maria Rochel | 1,618 | 0.9 | 0.1 | 1,464 | 0.9 | 0.0 |
| | Volksabstimmung | Helmut Fleck | Helmut Fleck | 1,150 | 0.7 | 0.3 | 809 | 0.5 | 0.0 |
| | PARTEI | | | | | | 713 | 0.4 | |
| | FW | Iryna May | Iryna May | 803 | 0.5 | | 534 | 0.3 | |
| | PRO | | | | | | 315 | 0.2 | |
| | ÖDP | | | | | | 238 | 0.1 | 0.0 |
| | Nichtwahler | | | | | | 205 | 0.1 | |
| | BIG | | | | | | 152 | 0.1 | |
| | REP | | | | | | 148 | 0.1 | 0.1 |
| | Party of Reason | | | | | | 138 | 0.1 | |
| | RRP | | | | | | 103 | 0.1 | 0.1 |
| | PSG | | | | | | 38 | 0.0 | 0.0 |
| | BüSo | | | | | | 23 | 0.0 | 0.0 |
| | Die Rechte | | | | | | 20 | 0.0 | |
| | MLPD | | | | | | 18 | 0.0 | 0.0 |
| Informal votes | Informal votes | Informal votes | Informal votes | 2,251 | | | 1,906 | | |
| Total valid votes | Total valid votes | Total valid votes | Total valid votes | 170,402 | | | 170,747 | | |
| Turnout | Turnout | Turnout | Turnout | 172,653 | 73.7 | 1.5 | | | |
| | CDU hold | CDU hold | Majority | 34,285 | 20.1 | 1.0 | | | |

### 2009 election

Federal election (2009): Rhein-Sieg-Kreis I :
| Notes: | Notes: | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. | Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively. |
| Party | Party | Candidate | Candidate | Votes | % | ±% | Party votes | % | ±% |
| | CDU | Y Elisabeth Winkelmeier-Becker | Y Elisabeth Winkelmeier-Becker | 73,959 | 44.9 | 0.7 | 58,516 | 35.4 | 2.3 |
| | SPD | Dietmar Tendler | Dietmar Tendler | 42,568 | 25.8 | 15.5 | 37,986 | 23.0 | 11.7 |
| | FDP | Markus Bestgen | Markus Bestgen | 18,727 | 11.4 | 7.0 | 31,488 | 19.1 | 6.9 |
| | Greens | Katja Ruiters | Katja Ruiters | 15,389 | 9.3 | 5.2 | 17,359 | 10.5 | 2.3 |
| | Left | Monika Dahl | Monika Dahl | 10,523 | 6.4 | 3.2 | 11,650 | 7.1 | 2.7 |
| | Pirates | | | | | | 2,887 | 1.7 | |
| | NPD | Ariane Christine Meise | Ariane Christine Meise | 1,765 | 1.1 | 0.2 | 1,462 | 0.9 | 0.0 |
| | Tierschutzpartei | | | | | | 1,113 | 0.7 | 0.2 |
| | Volksabstimmung | Helmut Fleck | Helmut Fleck | 1,581 | 1.0 | 0.4 | 741 | 0.4 | 0.1 |
| | FAMILIE | | | | | | 678 | 0.4 | 0.0 |
| | RENTNER | | | | | | 432 | 0.3 | |
| | Independent | Victor Trenkenschuh | Victor Trenkenschuh | 319 | 0.2 | | | | |
| | REP | | | | | | 271 | 0.2 | 0.0 |
| | RRP | | | | | | 194 | 0.1 | |
| | ÖDP | | | | | | 153 | 0.1 | |
| | Centre | | | | | | 100 | 0.1 | 0.0 |
| | DVU | | | | | | 93 | 0.1 | |
| | BüSo | | | | | | 21 | 0.0 | 0.0 |
| | MLPD | | | | | | 19 | 0.0 | 0.0 |
| | PSG | | | | | | 15 | 0.0 | 0.0 |
| Informal votes | Informal votes | Informal votes | Informal votes | 2,203 | | | 1,856 | | |
| Total valid votes | Total valid votes | Total valid votes | Total valid votes | 164,831 | | | 165,178 | | |
| Turnout | Turnout | Turnout | Turnout | 167,034 | 72.2 | 7.2 | | | |
| | CDU hold | CDU hold | Majority | 31,391 | 19.1 | 15.0 | | | |