Colorado House of Representatives seat · lines in effect since 2022
Colorado House District 43
A district of about 84,000 people, 66% of adults with a bachelor's degree. It votes D+6.9 relative to the nation for president.
Where it sits among all 65 seats
Every Colorado House of Representatives 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 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 | 2022 | 2024 | 2026 | |
|---|---|---|---|---|---|---|
| U.S. Senate | R+10.0 | No race | R+1.3 | No race | No race | No race |
| Governor | No race | R+4.2 | No race | No race | No race | No race |
| Colorado House of Representatives | No race | No race | No race | D+0.9 | D+2.5 | D+13.5 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: Colorado Secretary of State and civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 65 seats. Small marks are other seats in Colorado. The black marker is District 43.
Higher than 92% of seats.
Lower than 78% of seats.
Lower than 92% of seats.
Lower than 78% of seats.
Higher than 86% of seats.
Denser than 78% 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. 1 of the 4 flipped this year.
District 3359% college gradsD+23.4Held DDistrict 44
57% college gradsR+9.6CountingDistrict 19
52% college gradsD+8.4Flipped DDistrict 28
52% college gradsD+11.1Held 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
Who has held it
These lines took effect in 2022.
- Robert Marshall (D)
2023– · Won 2022 by 0.9, 2024 by 2.5, 2026 by 13.5
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)