Colorado State Senate seat · lines in effect since 2022
Colorado Senate District 5
A district of about 135,000 people, 21% Hispanic, 42% of adults with a bachelor's degree. It votes R+0.1 relative to the nation for president.
2024 election
Nov 5, 2024- Marc Catlin (R) · won52.2%
- Cole Buerger (D)47.8%
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 12:13 PM ET
Where it sits among all 35 seats
Every Colorado State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
16 races since 1968; the seat changed party 2 times. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2022 | |||
| 2024 | Marc Catlin (R) | Cole Buerger (D) | 4.5 |
| Lines first used in 2012 | |||
| 2018 | Kerry Donovan (D) | Olen Lund (R) | 20.9 |
| 2014 | Kerry Donovan (D) | Don Suppes (R) | 2.3 |
| Lines first used in 2002 | |||
| 2010 | Gail Schwartz (D) | Bob Rankin (R) | 2.1 |
| 2006 | Gail Schwartz (D)Flip | Lewis H. Entz (R) | 2.0 |
| 2002 | Lewis H. Entz (R) | Rafael Lorenzo Gallegos (D) | 20.9 |
| Lines first used in 1992 | |||
| 1998 | Ginette Dennis (R) | John Singletary (D) | 30.1 |
| 1994 | Ginette Dennis (R) | John L. Ribal (D) | 10.4 |
| Lines first used in 1982 | |||
| 1990 | Robert L. Pastore (D) | J. Don Berry (R) | 26.9 |
| 1986 | Robert L. Pastore (D) | John A. Wilson (R) | 0.6 |
| 1982 | C. Michael Callihan (D) | James R. Lillpop (R) | 11.7 |
| Lines first used in 1972 | |||
| 1980 | Barbara S. Holme (D) | Mike Shroyer (R) | 15.3 |
| 1976 | Barbara S. Holme (D) | Perrill (R) | 17.4 |
| 1974 special | Barbara S. Holme (D)Flip | Roseanne S. Ball (R) | 13.9 |
| 1972 | John R. Bermingham (R) | David J. Hahn (D) | 3.5 |
| Lines first used in 1962 | |||
| 1968 | Clarence Decker (D) | George F. Wilson (R) | 8.7 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 5
The state's districts in other chambers that share residents with this one, and the share of District 5's area in each.
- U.S. House
- CO-3 100%
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2020 | 2024 | |
|---|---|---|---|---|
| President | R+6.2 | No race | No race | R+0.6 |
| U.S. Senate | R+2.3 | No race | R+0.9 | No race |
| Governor | No race | D+3.3 | No race | No race |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 PM ET
Who lives here, compared
Grey bars show the spread of all 35 seats. Small marks are other seats in Colorado. The black marker is District 5.
Lower than 65% of seats.
Higher than 88% of seats.
Higher than 56% of seats.
Lower than 94% of seats.
Lower than 88% of seats.
Less dense than 88% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 622% Hispanic · 40% college gradsD+0.7Not up in 2026District 8
21% Hispanic · 45% college gradsD+10.6Held DDistrict 15
51% college gradsD+7.7Held DDistrict 4
45% college gradsR+17.9Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET