Colorado 21st State Senate District, Colorado: Urban anchor district. In 2024, voted D+15%. Democratic peak: D+74 in 1896.
Key facts
- 2024 presidential margin
- D+15MIT Election Lab
- Political archetype
- Urban anchorAkashic typology
- Population
- 791,5922024 5-year
- Median household income
- $97,6392024 5-year
- White (non-Hispanic)
- 57.0%2024 5-year
- Black
- 7.0%2024 5-year
- Hispanic / Latino
- 32.9%2024 5-year
- Peak Democratic margin
- D+74 in 1896MIT Election Lab
- Peak Republican margin
- R+48 in 1892MIT Election Lab
Constituent county margins for State Senate District 21, COOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
R+60D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 205,736 | 152,171 | 368,391 | ||
| D | 226,713 | 147,506 | 384,879 | ||
| D | 166,592 | 129,382 | 324,182 | ||
| D | 166,446 | 127,007 | 301,020 | ||
| D | 157,541 | 114,859 | 277,129 | ||
| R | 116,888 | 119,556 | 239,227 | ||
| R | 89,429 | 92,798 | 192,492 | ||
| D | 76,751 | 75,724 | 166,498 | ||
| D | 73,455 | 65,171 | 185,327 | ||
| R | 73,596 | 88,283 | 164,284 | ||
| R | 50,408 | 104,276 | 156,770 | ||
| R | 41,801 | 78,863 | 139,420 | ||
| R | 51,062 | 63,632 | 117,938 | ||
| R | 29,618 | 61,426 | 93,347 | ||
| R | 30,326 | 38,273 | 75,764 | ||
| D | 43,825 | 25,397 | 69,658 | ||
| R | 26,551 | 29,477 | 56,246 | ||
| R | 15,473 | 21,231 | 36,973 | ||
| R | 11,343 | 15,806 | 27,369 | ||
| D | 9,416 | 7,424 | 17,043 | ||
| R | 7,468 | 9,013 | 16,543 | ||
| R | 7,969 | 8,278 | 16,373 | ||
| D | 7,509 | 4,881 | 12,749 | ||
| D | 6,872 | 4,643 | 12,067 | ||
| R | 3,181 | 6,622 | 9,938 | ||
| R | 1,638 | 4,726 | 7,863 | ||
| R | 2,280 | 3,638 | 6,212 | ||
| D | 3,173 | 1,735 | 5,116 | ||
| D | 1,815 | 747 | 4,374 | ||
| R | 1,730 | 1,883 | 3,789 | ||
| R | 1,227 | 1,644 | 2,944 | ||
| D | 19,066 | 14,386 | 34,164 | ||
| D | 24,018 | 3,421 | 27,754 | ||
| O | 0 | 6,400 | 13,304 | ||
| R | 4,700 | 6,519 | 11,528 | ||
| R | 2,999 | 4,029 | 7,438 | ||
| R | 2,023 | 2,380 | 4,461 | ||
| — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
14.7%
English
9.6%
Irish
9.2%
Italian
4.1%
American
3.0%
French
1.9%
Scottish
1.0%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 36.0 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$97,639
State Senate District 21 ranks near the middle of US counties.
State Senate District 21$97,639
Colorado$95,470
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
9.2%
Child poverty is below the national average.
Children under 1812.8%
Working age (18–64)8.0%
Seniors (65+)9.8%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
73.5%
speak English only
Spanish18.7%
Other Indo-European3.1%
Asian & Pacific Islander2.9%
Other languages1.9%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 69.4% of residents not counted as adherents by any reporting body.
Colorado SD-21 covers a swath of the state's rural southern and eastern stretches, where R+17.8 presidential margins reflect a voting pattern consistent with ranching and agriculture-dependent communities that have trended heavily toward Republican candidates over the past decade.
The Democratic margin in Colorado 21st State Senate District has been steady. It reached its modern peak at seventy-four points in 1896; the 2024 margin was fifteen points, still in line with the district's long pattern.
Its political identity is inseparable from its demographic profile: a 57% non-Hispanic-white share, a median household income of $97,639, and the full diversity of a major metropolitan center.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 21, Colorado. Akashic. https://akashic.app/sld-upper/08021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State Senate District 21, Colorado vote in 2024?
In 2024, State Senate District 21, Colorado voted Democratic by 14.5 points (D+15), carried by the Democratic candidate. Out of 368,391 votes cast, 205,736 went Democratic and 152,171 went Republican.
What is State Senate District 21, Colorado's political archetype?
Akashic classifies State Senate District 21, Colorado as a "Urban anchor" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 15 times, Republican 21 times, and other 1 times.
When did State Senate District 21, Colorado last vote Republican?
The most recent presidential election in which State Senate District 21, Colorado voted Republican was 2004.
How many people live in State Senate District 21, Colorado?
State Senate District 21, Colorado has a population of 791,592 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 21, Colorado?
Median household income in State Senate District 21, Colorado is $97,639 — above the national median of $80,734. The Colorado state median is $95,470.
What is the political history of State Senate District 21, Colorado?
Akashic tracks 38 presidential elections in State Senate District 21, Colorado from 1876 to 2024. Of those, 15 went Democratic and 21 went Republican. The district's archetype — "Urban anchor" — captures the overall trajectory of that voting record.