Colorado State Senate seat · lines in effect since 2022
Colorado Senate District 31
A district of about 156,000 people, 72% of adults with a bachelor's degree. It votes D+66.7 relative to the nation for president.
2024 election
Nov 5, 2024- Chris Hansen (D) · won83.9%
- David Aitken (LIB)16.1%
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 1970; the seat changed party 1 time. 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 | Chris Hansen (D) | David Aitken (I) | 67.8 |
| Lines first used in 2012 | |||
| 2020 | Chris Hansen (D) | Doug Townsend (R) | 53.4 |
| 2016 | Lois Court (D) | Bob Lane (R) | 39.2 |
| 2012 | M. Patrick Steadman (D) | Michael Carr (R) | 39.8 |
| Lines first used in 2002 | |||
| 2010 special | M. Patrick Steadman (D) | Doug Smith (R) | 40.3 |
| 2008 | Jennifer L. Veiga (D) | William Leslie (R) | 50.1 |
| 2004 | Jennifer L. Veiga (D) | — | Unopposed |
| Lines first used in 1992 | |||
| 2000 | Doug Linkhart (D) | Al Mewborn (R) | 47.5 |
| 1996 | Doug Linkhart (D) | — | Unopposed |
| 1992 | Donald J. Mares (D) | — | Unopposed |
| Lines first used in 1982 | |||
| 1988 | Donald Sandoval (D) | Christine Valdez (R) | 50.2 |
| 1984 | Donald Sandoval (D) | — | Unopposed |
| Lines first used in 1972 | |||
| 1980 | Richard M. Soash (D) | Chuck Bailey (R) | 28.1 |
| 1976 | Richard M. Soash (D)Flip | Stoddard (R) | 4.1 |
| 1972 | Fay Deberard (R) | Richard M. Soash (D) | 1.7 |
| Lines first used in 1962 | |||
| 1970 | Christian Wunsch (D) | Jack Marshall Jr. (R) | 2.3 |
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 31
The state's districts in other chambers that share residents with this one, and the share of District 31's area in each.
- U.S. House
- CO-1 100%
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 | D+59.1 | No race | No race | D+64.4 |
| U.S. Senate | D+54.5 | No race | D+61.4 | No race |
| Governor | No race | D+61.5 | 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 31.
Higher than 97% of seats.
Lower than 94% of seats.
Lower than 79% of seats.
Higher than 79% of seats.
Higher than 50% of seats.
Densest of 35 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 1875% college gradsD+70.3Not up in 2026District 14
60% college gradsD+43.5Not up in 2026District 34
37% Hispanic · 55% college gradsD+61.5Held DDistrict 32
30% Hispanic · 50% college gradsD+50.1Held D
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