- Lead
- 4,841
- Total
- 32,210
- vs nation
- R+13.6
Colorado 21st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 3,942
- Total
- 32,934
- vs nation
- R+16.4
- Lead
- 6,229
- Total
- 27,317
- vs nation
- R+24.9
- Lead
- 5,191
- Total
- 24,752
- vs nation
- R+24.8
- Lead
- 4,572
- Total
- 23,312
- vs nation
- R+26.9
- Lead
- 7,284
- Total
- 20,615
- vs nation
- R+32.9
- Lead
- 5,737
- Total
- 17,155
- vs nation
- R+34.0
- Lead
- 4,126
- Total
- 14,892
- vs nation
- R+36.2
Key facts
- 2024 presidential margin
- R+15.0MIT Election Lab
- Population
- 88,5832024 5-year
- Population density
- 435 / sq mi2024 5-year · TIGER/Line
- Land area
- 204 sq miTIGER/Line
- Median household income
- $85,4742024 5-year
- White (non-Hispanic)
- 55.8%2024 5-year
- Black
- 9.5%2024 5-year
- Hispanic / Latino
- 22.1%2024 5-year
- Peak Democratic margin
- D+44.2 in 1896MIT Election Lab
- Peak Republican margin
- R+52.3 in 1984MIT Election Lab
- Most similar
- State House District 84, TX · twin score 74.4
presidential history
Party record book
Colorado 21st State House District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1880) · 37 presidential cycles · 37 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
William J. Bryan1896
70.6%
1,480 votes · D+44.2 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 55.9%
Republican
Ronald Reagan1984
75.6%
7,547 votes · R+52.3 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 75.4%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
13,648votes
41.4% of the vote · R+12.0 · modeled estimate
Runner-up · Kamala Harris, 2024 · 13,221 votes
Republican
Donald Trump2024
18,062votes
56.1% of the vote · R+15.0 · modeled estimate
Runner-up · Donald Trump, 2020 · 17,590 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
William J. Bryan1896
+50.3pts D vs U.S.
Place D+44.2 · U.S. R+6.1 · modeled estimate
Runner-up · Woodrow Wilson, 1916 · 0.0 pts
Republican
Benjamin Harrison1892
+42.3pts R vs U.S.
Place R+40.6 · U.S. D+1.7 · a third-party candidate carried the Place · modeled estimate
Runner-up · Bob Dole, 1996 · +36.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Colorado House District 21 covers communities along the foothills west of Denver, where the 2024 presidential margin landed at R+15.0 — well above the statewide average and consistent with the area's pattern of durable Republican preference.
Across the recorded series it reached a Democratic high of 44.2 points in 1896 and a Republican high of 52.3 points in 1984. Between 2020 and 2024 the district moved 3.1 points toward the Republican candidate; the 2024 margin was 15.0 points.
A population of 88,583, a 56% non-Hispanic-white share, and a median household income of $85,474 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 84 and State House District 14.
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Colorado 21st State House District. Akashic. https://akashic.app/sld-lower/08021/. Accessed May 20, 2026. License: CC BY 4.0.