akashic
1876–2024
State Senate District 21·California

California 21st State Senate District delivered D+18 in 2024 — a Democratic stronghold for as long as anyone now living can remember.

One of California's most reliably Republican legislative districts

1876 — 2024·38 elections
CA
Latest
D+18
in 2024
Archetype
Urban anchor
since the recent cycles
Population
1,312,598
2024 ACS

California 21st State Senate District, California: Urban anchor district. In 2024, voted D+18%. Republican peak: R+53 in 1924.

Key facts

2024 presidential margin
D+18MIT Election Lab
Political archetype
Urban anchorAkashic typology
Population
1,312,5982024 5-year
Median household income
$104,7712024 5-year
White (non-Hispanic)
52.2%2024 5-year
Black
1.7%2024 5-year
Hispanic / Latino
43.9%2024 5-year
Peak Democratic margin
D+41 in 1912MIT Election Lab
Peak Republican margin
R+53 in 1924MIT Election Lab
2024 results by constituent county
3 counties · 3 D · 0 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
D
+18.2%
343,121234,481596,383
D
+23.6%
392,350239,351647,367
D
+20.0%
309,561198,469555,557
D
+9.9%
273,036222,333510,407
D
+15.0%
302,360221,868536,875
R
−0.1%
248,345248,950504,604
R
−1.3%
211,556217,345453,984
D
+1.3%
186,880181,347417,984
D
+3.8%
174,766157,693446,483
R
−18.1%
158,354229,425392,619
R
−33.2%
122,176245,611372,223
R
−27.1%
99,724188,869329,039
R
−7.0%
126,897146,691281,922
R
−21.9%
103,499164,528278,143
R
−11.6%
87,054111,744213,547
D
+15.3%
109,51780,360190,126
R
−7.1%
67,34677,698145,605
R
−15.3%
45,24861,663107,358
R
−21.0%
37,72257,91196,111
R
−5.6%
32,71036,77772,068
D
+11.4%
33,73826,81260,788
D
+11.6%
34,38927,16862,184
D
+25.2%
31,20718,52550,422
D
+22.1%
26,44516,49644,926
R
−38.5%
9,67122,00832,029
R
−53.1%
2,36215,31224,388
R
−46.4%
4,42113,37219,289
R
−0.0%
9,2069,20819,880
O
+40.6%
5,641013,892
R
−20.5%
3,2715,2179,509
R
−33.9%
2,3885,3008,578
R
−8.2%
3,5044,1688,056
R
−0.1%
4,0814,0898,395
R
−8.5%
2,5843,2277,547
R
−5.1%
3,0333,3766,673
R
−8.4%
2,0332,4254,677
R
−8.3%
1,4871,7883,645
R
−10.1%
1,6642,0393,704

Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
9.1%
English
8.9%
Irish
8.0%
Italian
4.3%
American
2.9%
French
1.8%
Polish
0.9%
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: 38.0 in this county, 39.1 nationally
Male
Age
Female
0.9%
85+
1.3%
2.4%
75–84
2.9%
4.9%
65–74
5.3%
6.1%
55–64
6.3%
5.9%
45–54
5.8%
6.4%
35–44
6.0%
6.7%
25–34
6.3%
5.8%
18–24
5.6%
8.2%
5–17
7.9%
2.8%
<5
2.7%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$104,771
State Senate District 21 ranks near the middle of US counties.
State Senate District 21$104,771
California$99,122
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
11.4%
Child poverty is below the national average.
Children under 1814.4%
Working age (18–64)10.7%
Seniors (65+)10.2%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
62.7%
speak English only
Spanish29.8%
Asian & Pacific Islander3.7%
Other Indo-European2.7%
Other languages1.0%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
30.0%
Other Christian
8.5%
Non-Christian
4.1%
Pentecostal & Holiness
2.5%
Mainline Protestant
1.6%
Baptist
1.2%
Methodist
0.5%
Source · 2020 US Religion Census. Remaining 51.6% of residents not counted as adherents by any reporting body.

Anchored in the inland regions of Southern California, this district posts presidential margins exceeding 30 points in a state Democrats dominate statewide, making it a consistent outlier in California's legislative map.

The Democratic margin in California 21st State Senate District has been steady. It reached its modern peak at forty-one points in 1912; the 2024 margin was eighteen points, still in line with the district's long pattern.

Its political identity is inseparable from its demographic profile: a 52% non-Hispanic-white share, a median household income of $104,771, 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, California. Akashic. https://akashic.app/sld-upper/06021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 21, California vote in 2024?
In 2024, State Senate District 21, California voted Democratic by 18.2 points (D+18), carried by the Democratic candidate. Out of 596,383 votes cast, 343,121 went Democratic and 234,481 went Republican.
What is State Senate District 21, California's political archetype?
Akashic classifies State Senate District 21, California as a "Urban anchor" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 12 times, Republican 25 times, and other 1 times.
When did State Senate District 21, California last vote Republican?
The most recent presidential election in which State Senate District 21, California voted Republican was 2004.
How many people live in State Senate District 21, California?
State Senate District 21, California has a population of 1,312,598 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, California?
Median household income in State Senate District 21, California is $104,771 — above the national median of $80,734. The California state median is $99,122.
What is the political history of State Senate District 21, California?
Akashic tracks 38 presidential elections in State Senate District 21, California from 1876 to 2024. Of those, 12 went Democratic and 25 went Republican. The district's archetype — "Urban anchor" — captures the overall trajectory of that voting record.