† Citizen voting-age population estimated for prior cycles; 2004 predates the ACS and is extrapolated. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
Boundary by 2024 margin · Precinct returns · VEST · 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
GroupSouth San FranciscoCaliforniaUnited States
Chinese17.6%3.9%1.3%
Filipino12.3%3.3%0.9%
Asian Indian4.5%2.3%1.4%
Japanese1.6%0.6%0.2%
Korean1.4%1.2%0.4%
Vietnamese0.8%1.7%0.6%
Taiwanese0.7%0.3%—
Burmese0.5%——
Mexican18.6%32.3%11.3%
Salvadoran3.9%2.0%0.7%
Guatemalan2.1%1.3%0.5%
Nicaraguan1.4%0.3%—
Peruvian1.0%——
Puerto Rican0.8%0.6%1.8%
Spaniard0.6%0.3%—
Colombian0.5%0.3%0.4%
Irish4.5%5.9%9.4%
German4.1%6.8%12.5%
English4.1%6.3%9.5%
Italian3.4%3.4%4.8%
American1.9%2.8%5.3%
French1.2%1.3%1.6%
Scottish0.9%0.9%1.3%
Russian0.9%——
African American†1.4%4.4%9.9%
Tongan3.9%——
Maya2.4%——
Aztec2.4%0.3%—
Samoan2.4%——
Fijian1.6%——
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
South San Francisco
California
United States
Median age
43.2
37.9
39.1
Age 18–24
7.5%
9.1%
9.2%
Age 65 and older
19.2%
15.6%
17.2%
Household economy
Measure
South San Francisco
California
United States
Median household income
$136,578
$99,122
$84,427
Poverty rate
6.7%
12.0%
12.5%
Bachelor's degree or higher (25+)
40.8%
36.6%
35.6%
Languages at home
Measure
South San Francisco
California
United States
Speaks a non-English language at home
53.8%
44.4%
22.3%
Spanish
20.7%
28.4%
13.6%
Other Indo-European
3.1%
3.4%
2.0%
Chinese (incl. Mandarin & Cantonese)
11.4%
3.5%
1.1%
Tagalog (incl. Filipino)
13.1%
2.1%
0.6%
Religious landscape
Measure
South San Francisco
California
United States
Catholic
—
26.2%
18.6%
Evangelical Protestant
—
9.0%
16.5%
Unclaimed / not counted
—
55.2%
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.
South San Francisco, California
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+45.7%
2008
+52.5%
2012
+56.6%
2016
+60.5%
2020
+54.7%
2024
+43.4%
DemocraticRepublican
6 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. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
D
70.0%Harris18,203
26.6%Trump6,918
3.4%
D+43.4
R+11.3
D+44.9
25,994
D
76.6%Biden23,658
21.8%Trump6,749
1.6%
D+54.7
R+5.7
D+50.3
30,890
D
78.3%Clinton18,468
17.8%Trump4,197
4.0%
D+60.5
D+3.8
D+58.4
23,599
D
77.1%Obama16,151
20.5%Romney4,289
2.4%
D+56.6
D+4.1
D+52.8
20,944
D
76.1%Obama15,585
23.6%McCain4,833
0.3%
D+52.5
D+6.8
D+45.2
20,480
D
72.1%Kerry15,059
26.4%Bush5,519
1.5%
D+45.7
—
D+48.1
20,887
South San Francisco anchors one of the densest concentrations of biotech employment in the U.S., shaping a workforce-driven electorate that leans heavily Democratic but remains attentive to land-use and housing pressures along the Peninsula.
Across the recorded series it reached a Democratic high of 60.5 points in 2016. Between 2020 and 2024 the city moved 11.3 points toward the Republican candidate; the 2024 margin was 43.4 points.
A population of 64,305, a 21% non-Hispanic-white share, and a median household income of $136,578 describe the city. The city's voting pattern over the last decade is most similar to that of San Bruno and Daly City.
Akashic
Political twins — cities
The cities 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.
How did South San Francisco, California vote in 2024?
In 2024, South San Francisco, California voted Democratic by 43.4 points (D+43.4), carried by the Democratic candidate. Out of 25,994 votes cast, 18,203 went Democratic and 6,918 went Republican.
How many people live in South San Francisco, California?
South San Francisco, California has a population of 64,305 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in South San Francisco, California?
Median household income in South San Francisco, California is $136,578 — above the national median of $80,734. The California state median is $99,122.
What is the political history of South San Francisco, California?
Akashic tracks 6 presidential elections in South San Francisco, California from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
