How did CO-SD-21, Colorado vote in the 2024 presidential election?

CO-SD-21, Colorado voted Democratic in 2024 with a margin of D+3.7. Kamala D Harris received 36,162 votes and Donald Trump received 33,527 out of 71,612 total votes cast, a 11.3-point shift toward Republicans from 2020.

What is CO-SD-21, Colorado's political history?

CO-SD-21, Colorado has 5 presidential elections on record, spanning 2008 to 2024. It has voted Democratic in every presidential election since 2008. The largest single-election swing was 13.2 points in 2016.

What are the demographics of CO-SD-21, Colorado?

CO-SD-21, Colorado has a population of 168,413 according to the 2020 Census. The racial composition is 41.2% non-Hispanic white, 49.2% Hispanic, 2.6% Black.

Which places are most similar to CO-SD-21, Colorado?

Based on demographic and electoral similarity analysis, the three most similar state senate districts to CO-SD-21, Colorado are New Mexico State Senate District 31, New Mexico State Senate District 14, Kansas State Senate District 6. Similarity is computed using a vector embedding of demographic, economic, and electoral characteristics.

Colorado State Senate District 21

Colorado · Latest: 2024↓ R+11.3 vs 2020

Competitive — shifted 11.3pp toward Republicans in 2024 — 168K residents

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Similarity Explorer

Similar state senate districts

Nearest neighbors matched on the same place-page feature set used across the dossier system.

8 visible matches

New Mexico State Senate District 31NM

Diverse urban competitive

D+8.1

Similarity score96%

New Mexico State Senate District 14NM

Diverse urban competitive

D+12.3

Similarity score95%

Kansas State Senate District 6KS

Diverse urban competitive

D+22.4

Similarity score92%

Colorado State Senate District 3CO

Diverse urban competitive

R+5.1

Similarity score92%

New Mexico State Senate District 11NM

Diverse urban competitive

D+16.0

Similarity score91%

California State Senate District 18CA

Diverse urban competitive

D+13.1

Similarity score91%

New Mexico State Senate District 5NM

Diverse urban competitive

D+25.8

Similarity score91%

New Mexico State Senate District 26NM

Diverse urban competitive

D+18.5

Similarity score91%

Historian Query

Ask the Historian

Explore CO-SD-21's political evolution with the Historian

“How has Colorado State Senate District 21 voted in presidential elections?”

Race & Ancestry

Who Lives Here

A race-first Census view with ancestry expansion where source coverage is strong enough to support detail.

CO-SD-21Census ACS 2024

Census race profile

Major Census race and ethnicity groups shown as a share of total population.

Expand rows for ancestry detail

Hispanic 49.2%White (Non-Hispanic) 41.2%Asian 3.0%Black 2.6%Native American 2.1%Multiracial 1.7%

Group	CO-SD-21	State	National
Hispanic / Latino	49.2%	22.5%	19.3%
White (Non-Hispanic)	41.2%	64.8%	57.4%
Asian	3.0%	3.3%	6.0%
Black / African American	2.6%	4.0%	12.2%
Native American / Alaska Native	2.1%	1.1%	0.9%
Multiracial / Other	1.7%	4.1%	4.0%
Native Hawaiian / Pacific Islander	0.2%	0.2%	0.2%

Method notes

Census treats race and Hispanic/Latino origin as separate questions. Race categories other than Hispanic reflect total populations (small Hispanic overlap in Black, Asian, AIAN, NHPI). “Multiracial / Other” is derived as a non-overlapping remainder.

Detailed ancestry data unavailable for this geography.

Who lives in Colorado State Senate District 21? 168,413 residents as of the 2020 Census.

Demographic Comparison

Demographics

Read this geography's profile in three layers: local, state (where available), and national baseline.

CO-SD-21 vs Colorado vs National168K residents

Population & electorate

Scale, voting-age share, and this geography's footprint inside the national electorate.

Total population

Local vs state vs U.S.

168K

local

168KState 5.9MNational 334.9M

Share of U.S. population

Local vs state vs U.S.

0.05%

local

0.05%National 100%

Voting-age population

Local vs state vs U.S.

73.2%

local

73.2%State 76.9%National 75.7%

Economic profile

Income, attainment, and ownership indicators that often shape coalition structure and turnout behavior.

Median household income

Local vs state vs U.S.

N/A

local

N/AState $97,187National $83,960

Poverty rate

Local vs state vs U.S.

N/A

local

N/AState 9.5%National 12.5%

College degree

Local vs state vs U.S.

N/A

local

N/AState 45.5%National 35.6%

Homeownership

Local vs state vs U.S.

N/A

local

N/AState 66.2%National 65.2%

Community profile

Age structure, language use, and nativity signals that explain how this geography differs from state and nation.

Median age

Local vs state vs U.S.

N/A

local

N/AState 37.9 yrsNational 39.1 yrs

Age 18–29

Local vs state vs U.S.

N/A

local

N/AState 16.8%National 15.7%

Age 65+

Local vs state vs U.S.

N/A

local

N/AState 15.6%National 17.0%

Foreign born

Local vs state vs U.S.

N/A

local

N/AState 9.8%National 14.1%

Non-English at home

Local vs state vs U.S.

N/A

local

N/AState 16.2%National 22.2%

English only

Local vs state vs U.S.

N/A

local

N/AState 83.8%National 77.8%

Voter Turnout

Turnout in CO-SD-21

Estimated using 2020 Census voting-age population.

2024 Turnout

58.1%

vs Previous

+0.1pp

Voting-Age Pop

123,291

History

2008–2024

Competitiveness

How competitive is CO-SD-21?

Lean DAvg margin: D+9.0 (last 3 elections)

2008

D+20.2

2012

D+21.7

2016

D+8.5

2020

D+14.9

2024

D+3.7

Elasticity

18.0pp

margin range

Party Flips

last 30 years

5-Elec Avg

D+13.8

Other Colorado State Senate Districts

34 total

Name	Margin ↓
CO-SD-18	D+68.0
CO-SD-31	D+64.3
CO-SD-33	D+61.5
CO-SD-34	D+57.7
CO-SD-32	D+47.6
CO-SD-14	D+42.7
CO-SD-17	D+39.6
CO-SD-22	D+32.9
CO-SD-26	D+30.0
CO-SD-29	D+27.0
CO-SD-28	D+25.6
CO-SD-25	D+23.1
CO-SD-19	D+19.1
CO-SD-20	D+17.3
CO-SD-16	D+12.8
CO-SD-27	D+11.9
CO-SD-08	D+10.2
CO-SD-15	D+7.7
CO-SD-24	D+6.8
CO-SD-11	D+4.3
CO-SD-12	D+4.0
CO-SD-30	D+2.5
CO-SD-06	D+0.6
CO-SD-05	R+0.7
CO-SD-03	R+5.1

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