† Citizen voting-age population estimated for prior cycles; 2004 predates the ACS and is extrapolated. Source: ACS 5-year, table B05003.
——
D+60R+60
1 counties by 2024 margin · County returns · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupBoulder, COColoradoUnited States
German18.1%17.9%12.5%
English15.1%12.6%9.5%
Irish12.6%11.2%9.4%
Italian5.3%4.9%4.8%
Polish3.1%2.1%2.2%
American3.0%3.5%5.3%
French2.9%2.0%1.6%
Scottish2.9%2.5%1.3%
Mexican9.9%15.8%11.3%
Spanish0.8%1.2%—
Spaniard0.7%1.0%—
Puerto Rican0.5%0.7%1.8%
Salvadoran0.3%0.3%0.7%
Cuban0.2%0.3%0.7%
Guatemalan0.2%—0.5%
Honduran0.2%—0.3%
Chinese1.4%0.6%1.3%
Asian Indian1.1%0.6%1.4%
Korean0.4%0.3%0.4%
Japanese0.3%—0.2%
Nepalese0.3%——
Filipino0.2%0.3%0.9%
Vietnamese0.2%0.4%0.6%
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
Boulder, CO
Colorado
United States
Median age
37.7
37.9
39.1
Age 18–24
15.4%
9.2%
9.2%
Age 65 and older
16.3%
15.5%
17.2%
Household economy
Measure
Boulder, CO
Colorado
United States
Median household income
$103,994
$95,470
$84,427
Poverty rate
11.2%
9.5%
12.5%
Bachelor's degree or higher (25+)
64.2%
45.5%
35.6%
Languages at home
Measure
Boulder, CO
Colorado
United States
Speaks a non-English language at home
15.1%
16.2%
22.3%
Spanish
8.2%
11.1%
13.6%
Other Indo-European
1.7%
1.0%
2.0%
Chinese (incl. Mandarin & Cantonese)
1.1%
0.5%
1.1%
Other Asian & Pacific Island
1.0%
0.7%
1.1%
Religious landscape
Measure
Boulder, CO
Colorado
United States
Catholic
16.0%
15.1%
18.6%
Evangelical Protestant
12.6%
11.7%
16.5%
Unclaimed / not counted
63.7%
64.7%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Boulder, CO
presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
1892
−36.4%
1896
+69.5%
1900
+15.2%
1904
−14.3%
1908
+7.9%
1912
+17.7%
1916
+28.4%
1920
−20.2%
1924
−33.4%
1928
−36.3%
1932
+5.5%
1936
+14.5%
1940
−7.5%
1944
−14.8%
1948
−7.8%
1952
−31.6%
1956
−34.3%
1960
−23.3%
1964
+13.3%
1968
−21.4%
1972
−15.7%
1976
−11.7%
1980
−14.1%
1984
−11.7%
1988
+8.5%
1992
+24.5%
1996
+17.6%
2000
+13.7%
2004
+33.9%
2008
+46.1%
2012
+41.8%
2016
+48.3%
2020
+56.6%
2024
+55.7%
DemocraticRepublican
34 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
D
76.5%Harris150,149
20.8%Trump40,758
2.7%
D+55.7
R+0.8
D+57.2
196,304
D
77.2%Biden159,089
20.6%Trump42,501
2.2%
D+56.6
D+8.2
D+52.1
206,111
D
70.3%Clinton132,334
22.0%Trump41,396
7.7%
D+48.3
D+6.5
D+46.2
188,145
D
69.7%Obama125,091
27.8%Romney49,981
2.5%
D+41.8
R+4.3
D+38.0
179,499
D
72.3%Obama124,159
26.1%McCain44,904
1.6%
D+46.1
D+12.2
D+38.9
171,763
D
66.3%Kerry105,564
32.4%Bush51,586
1.3%
D+33.9
D+20.2
D+36.4
159,259
D
50.1%Gore69,983
36.4%Bush50,873
13.4%
D+13.7
R+3.9
D+13.2
139,626
D
52.2%Clinton63,316
34.5%Dole41,922
13.3%
D+17.6
R+6.8
D+9.1
121,354
D
50.9%Clinton64,567
26.5%Bush33,553
22.6%
D+24.5
D+16.0
D+18.9
126,771
D
53.4%Dukakis57,265
44.9%Bush48,174
1.7%
D+8.5
D+20.1
D+16.2
107,223
R
43.4%Mondale42,195
55.1%Reagan53,535
1.5%
R+11.7
D+2.4
D+6.6
97,223
R
32.6%Carter28,422
46.7%Reagan40,698
20.6%
R+14.1
R+2.4
R+4.4
87,069
R
41.0%Carter33,284
52.7%Ford42,830
6.3%
R+11.7
D+4.0
R+13.8
81,253
R
41.1%McGovern29,484
56.8%Nixon40,766
2.1%
R+15.7
D+5.6
D+7.4
71,770
R
36.3%Humphrey17,422
57.7%Nixon27,671
6.0%
R+21.4
R+34.7
R+20.7
47,988
D
56.4%Johnson22,737
43.1%Goldwater17,373
0.5%
D+13.3
D+36.6
R+9.3
40,330
R
38.1%Kennedy12,276
61.5%Nixon19,791
0.4%
R+23.3
D+11.0
R+23.5
32,197
R
32.5%Stevenson8,149
66.9%Eisenhower16,748
0.6%
R+34.3
R+2.7
R+18.9
25,039
R
33.7%Stevenson7,767
65.3%Eisenhower15,069
1.1%
R+31.6
R+23.9
R+20.9
23,079
R
44.3%Truman8,792
52.1%Dewey10,335
3.6%
R+7.8
D+7.1
R+12.3
19,839
R
42.3%Roosevelt7,442
57.1%Dewey10,054
0.6%
R+14.8
R+7.3
R+22.3
17,610
R
45.7%Roosevelt9,039
53.2%Willkie10,525
1.1%
R+7.5
R+22.1
R+17.5
19,776
D
55.9%Roosevelt9,788
41.4%Landon7,244
2.7%
D+14.5
D+9.0
R+9.7
17,501
D
50.4%Roosevelt8,412
44.8%Hoover7,487
4.8%
D+5.5
D+41.9
R+12.3
16,707
R
31.1%Smith4,363
67.5%Hoover9,457
1.4%
R+36.3
R+2.9
R+18.9
14,015
R
25.3%Davis3,273
58.8%Coolidge7,595
15.9%
R+33.4
R+13.2
R+8.3
12,927
R
37.7%Cox4,200
57.9%Harding6,456
4.4%
R+20.2
R+48.7
D+6.0
11,148
D
61.5%Wilson7,419
33.0%Hughes3,986
5.5%
D+28.4
D+10.7
D+25.3
12,071
D
40.8%Wilson4,330
23.0%Taft2,445
36.2%
D+17.7
D+9.9
R+1.8
10,620
D
49.6%Bryan5,772
41.8%Taft4,856
8.6%
D+7.9
D+22.2
D+17.4
11,629
R
39.6%Parker4,030
53.9%Roosevelt5,483
6.5%
R+14.3
R+29.5
D+5.4
10,172
D
55.8%Bryan5,117
40.6%McKinley3,719
3.6%
D+15.2
R+54.3
D+22.8
9,168
D
83.9%Bryan6,046
14.3%McKinley1,033
1.8%
D+69.5
D+106.0
D+75.6
7,209
O
0.0%Cleveland0
36.4%Harrison1,338
63.6%
Weaver +27.2
—
R+38.1
3,674
Congressional elections · 2 Senate races
U.S. Senate
Source · MIT Election Lab (MEDSL), Senate. CC-BY 4.0.
Year
Won
Democratic
Republican
Total
2022
D
77.5%128,227
20.5%33,858
165,434
2020
D
75.2%154,552
23.0%47,321
205,536
voter registration
Registered voters
By party of registration, over time
Party registration · 2024D+28.0
vs
Presidential vote · 2024D+55.7
Registration leans Democratic; the presidential vote runs 28 points more Republican.
DemocraticRepublicanUnaffiliatedOther parties
Voter registration in Boulder, CO
Year
Total registered
Democratic
Republican
Unaffiliated
Other
2016
266,217
113,733
45,569
101,653
5,262
2018
251,112
107,352
37,701
101,246
4,813
2020
257,455
109,959
34,264
109,012
4,220
2022
258,327
105,079
29,623
119,557
4,068
2024
266,648
102,792
28,261
130,436
5,159
domestic migration
Who moves in and out
Net domestic migration over time
−2,248 net domestic migration · 2025
20112025
Net +2,985 over 2011–2025 · gain loss
Domestic migration in Boulder, CO in Boulder, CO: net domestic migration by year
Year
Net domestic migration
2011
+2,416
2012
+2,401
2013
+2,715
2014
+788
2015
+3,499
2016
+1,288
2017
−423
2018
+491
2019
−42
2021
−4,247
2022
−624
2023
−1,976
2024
−1,053
2025
−2,248
Boulder's electorate skews younger and more degree-holding than any other Colorado metro, a demographic profile that has made it among the most consistently lopsided jurisdictions on the Front Range for two decades.
Across the recorded series it reached a Democratic high of 69.5 points in 1896 and a Republican high of 36.4 points in 1892. Between 2020 and 2024 the metro moved 0.8 points toward the Republican candidate; the 2024 margin was 55.7 points.
A population of 328,961, a 75% non-Hispanic-white share, and a median household income of $103,994 describe the metro. The metro's voting pattern over the last decade is most similar to that of Charlottesville, VA and Ann Arbor, MI.
Akashic
Political twins — metros
The metros 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.
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 →
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Boulder, CO, Colorado. Akashic. https://akashic.app/cbsa/14500/. Accessed May 20, 2026. License: CC BY 4.0.
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In 2024, Boulder, CO, Colorado voted Democratic by 55.7 points (D+55.7), carried by the Democratic candidate. Out of 196,304 votes cast, 150,149 went Democratic and 40,758 went Republican.
When did Boulder, CO, Colorado last vote Republican?
The most recent presidential election in which Boulder, CO, Colorado voted Republican was 1984.
How many people live in Boulder, CO, Colorado?
Boulder, CO, Colorado has a population of 328,961 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Boulder, CO, Colorado?
Median household income in Boulder, CO, Colorado is $103,994 — above the national median of $80,734. The Colorado state median is $95,470.
What is the political history of Boulder, CO, Colorado?
Akashic tracks 34 presidential elections in Boulder, CO, Colorado from 1892 to 2024. Of those, 18 went Democratic and 15 went Republican.
