Colorado State Senate seat · lines in effect since 2022
Colorado Senate District 21
A district of about 173,000 people, 50% Hispanic, 24% of adults with a bachelor's degree. It votes D+6.8 relative to the nation for president.
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 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 | |
|---|---|---|---|
| U.S. Senate | D+12.8 | No race | D+14.0 |
| Governor | No race | D+14.1 | 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 7, 2026, 3:01 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 21.
Lower than 97% of seats.
Lower than 65% of seats.
Highest of 35 seats.
Higher than 59% of seats.
Lower than 71% of seats.
Less dense than 74% 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 342% Hispanic · 26% college gradsR+3.5CountingDistrict 13
45% Hispanic · 22% college gradsR+9.7Not up in 2026District 24
40% Hispanic · 32% college gradsD+8.5Held DDistrict 11
30% Hispanic · 26% college gradsD+5.3Counting
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