state house districtCalifornia 42nd State House District
presidential margin
2004–2024 · Democratic minus Republican
2004R+4.2
2008D+10.7
2012D+1.8
2016D+16.4
2020D+19.0
2024D+14.2
net swing · 2004→2024D+18.4R+4.2 → D+14.2
vs. U.S. · 2024D+15.7D+14.2 vs R+1.5
presidential returns
2024 turnout 75.4% of 378,694 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
159,101
118,594
7,798
285,493
378,694
75.4%
2020
181,405
122,512
6,104
310,021
376,927†
82.2%
2016
142,410
100,257
14,708
257,375
361,544†
71.2%
2012
125,068
120,610
6,609
252,287
338,968†
74.4%
2008
140,569
113,301
541
254,411
322,375†
78.9%
2004
116,447
126,863
2,158
245,468
305,782†
80.3%
† Citizen voting-age population estimated for prior cycles from the constituent-county ACS trend anchored to the current figure. 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
GroupCA HD 42CaliforniaUnited States
German4.4%6.8%12.5%
English4.0%6.3%9.5%
Irish4.0%5.9%9.4%
American2.6%2.8%5.3%
Italian2.4%3.4%4.8%
Armenian1.3%——
French1.0%1.3%1.6%
Polish1.0%0.9%2.2%
Mexican1.9%32.3%11.3%
Salvadoran0.2%2.0%0.7%
Chinese0.7%3.9%1.3%
Filipino0.6%3.3%0.9%
Korean0.3%1.2%0.4%
Asian Indian0.2%2.3%1.4%
Vietnamese0.2%1.7%0.6%
Japanese0.2%0.6%0.2%
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
CA HD 42
California
United States
Median age
43.9
37.9
39.1
Age 18–24
8.9%
9.1%
9.2%
Age 65 and older
15.7%
15.6%
17.2%
Household economy
Measure
CA HD 42
California
United States
Median household income
$142,840
$99,122
$84,427
Poverty rate
7.2%
12.0%
12.5%
Bachelor's degree or higher (25+)
36.0%
36.6%
35.6%
Languages at home
Measure
CA HD 42
California
United States
Speaks a non-English language at home
51.3%
44.4%
22.3%
Spanish
35.9%
28.4%
13.6%
Other Indo-European
3.6%
3.4%
2.0%
Chinese (incl. Mandarin & Cantonese)
3.4%
3.5%
1.1%
Tagalog (incl. Filipino)
2.1%
2.1%
0.6%
Religious landscape
Measure
CA HD 42
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.
California 42nd State House District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−4.2%
2008
+10.7%
2012
+1.8%
2016
+16.4%
2020
+19.0%
2024
+14.2%
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, 2024 sub-county results are estimated: the source's block-level detail for these cycles 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
55.7%Harris159,101
41.5%Trump118,594
2.7%
D+14.2
R+4.8
D+15.7
285,493
D
58.5%Biden181,405
39.5%Trump122,512
2.0%
D+19.0
D+2.6
D+14.5
310,021
D
55.3%Clinton142,410
39.0%Trump100,257
5.7%
D+16.4
D+14.6
D+14.3
257,375
D
49.6%Obama125,068
47.8%Romney120,610
2.6%
D+1.8
R+9.0
R+2.1
252,287
D
55.3%Obama140,569
44.5%McCain113,301
0.2%
D+10.7
D+15.0
D+3.4
254,411
R
47.4%Kerry116,447
51.7%Bush126,863
0.9%
R+4.2
—
R+1.8
245,468
current representation
Current officeholders
DJacqui IrwinState House · 42
State legislative officeholder from OpenStates nightly current-legislator data.
The district recorded a Democratic presidential margin of D+14.2 in 2024, compared with D+10.7 in 2008. No racial group formed a majority of its residents in the 2024 ACS 5-year, with Hispanic or Latino residents at 47.5%.
Across the recorded series it reached a Democratic high of 19.0 points in 2020 and a Republican high of 4.2 points in 2004. Between 2020 and 2024 the district moved 4.8 points toward the Republican candidate; the 2024 margin was 14.2 points.
A population of 516,102, a 23% non-Hispanic-white share, and a median household income of $142,840 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 66 and Assembly District 41.
Akashic
Political twins — state-house districts
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.
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.
California 42nd State House District. Akashic. https://akashic.app/sld-lower/06042/. Accessed May 20, 2026. License: CC BY 4.0.
How did California 42nd State House District vote in 2024?
In 2024, California 42nd State House District voted Democratic by 14.2 points (D+14.2), carried by the Democratic candidate. Out of 285,493 votes cast, 159,101 went Democratic and 118,594 went Republican.
When did California 42nd State House District last vote Republican?
The most recent presidential election in which California 42nd State House District voted Republican was 2004.
How many people live in California 42nd State House District?
California 42nd State House District has a population of 516,102 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in California 42nd State House District?
Median household income in California 42nd State House District is $142,840 — above the national median of $80,734. The California state median is $99,122.
What is the political history of California 42nd State House District?
Akashic tracks 6 presidential elections in California 42nd State House District from 2004 to 2024. Of those, 5 went Democratic and 1 went Republican.
