California Assembly District 4

State Legislative District Profile (Lower Chamber)

Overview

District ID
ca-hd-004
State
California
Chamber
Lower chamber
District Code
004
Land Area
4,196.6 sq mi
Water Area
127.9 sq mi

Boundary

Boundary of California Assembly District 4

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Lake County1256.55 sq mi29.9%100.0%
Colusa County1150.71 sq mi27.4%100.0%
Yolo County1014.73 sq mi24.2%100.0%
Napa County748.28 sq mi17.8%99.5%
Sonoma County25.87 sq mi0.6%1.6%

Showing all 5 counties

Places

PlaceOverlapShare of district landShare of place land
West Sacramento city21.47 sq mi0.5%100.0%
Napa city18.05 sq mi0.4%100.0%
Woodland city15.31 sq mi0.4%100.0%
Clearlake city10.13 sq mi0.2%100.0%
Davis city9.97 sq mi0.2%100.0%
Hidden Valley Lake CDP9.82 sq mi0.2%100.0%
American Canyon city6.09 sq mi0.1%100.0%
Deer Park CDP5.62 sq mi0.1%100.0%
Lucerne CDP5.37 sq mi0.1%99.9%
Clearlake Riviera CDP5.29 sq mi0.1%100.0%
Dunnigan CDP5.23 sq mi0.1%100.0%
Cobb CDP4.98 sq mi0.1%100.0%
St. Helena city4.95 sq mi0.1%99.9%
Williams city4.94 sq mi0.1%100.0%
Spring Valley CDP4.93 sq mi0.1%100.0%
Angwin CDP4.83 sq mi0.1%100.0%
Esparto CDP4.60 sq mi0.1%100.0%
Brooks CDP4.30 sq mi0.1%100.0%
Monument Hills CDP3.99 sq mi0.1%100.0%
North Lakeport CDP3.80 sq mi0.1%99.6%
Colusa city3.42 sq mi0.1%78.5%
Lodoga CDP3.39 sq mi0.1%100.0%
Lakeport city3.06 sq mi0.1%100.0%
Winters city2.93 sq mi0.1%100.0%
College City CDP2.93 sq mi0.1%100.0%

Showing top 25 of 57 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
CA District 4398,81684.0%52.1%71.7%
CA District 754,07411.4%7.1%0.9%
CA District 121,8394.6%2.9%27.4%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Demographics

Total Population
476,114 (± 1,570)
Median Age
38.1
Median Household Income
$91,167 (± $1,934)
High School Graduate or Higher (age 25+)
86.7%
Bachelor's Degree or Higher (age 25+)
37.4%

Population by Age

GroupPeopleShare
Under 1896,93020.4%
18 to 64293,42861.6%
65 and over85,75618.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)162,95534.2%
White, not Hispanic226,31947.5%
Black, not Hispanic9,6272.0%
Asian, not Hispanic45,5349.6%
American Indian / Alaska Native, not Hispanic2,2630.5%
Native Hawaiian / Pacific Islander, not Hispanic1,5430.3%
Some other race, not Hispanic2,9650.6%
Two or more races, not Hispanic24,9085.2%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
429,257
Citizen Voting Age Population (CVAP)
335,253

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic296,48269.1%
Hispanic132,77830.9%
White227,89453.1%
Black9,5642.2%
Asian35,7928.3%
American Indian / Alaska Native2,3140.5%
Native Hawaiian / Pacific Islander1,4260.3%
Two or More Races3,4560.8%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic248,11674.0%
Hispanic87,13326.0%
White194,83758.1%
Black9,7902.9%
Asian35,13110.5%
American Indian / Alaska Native5,2721.6%
Native Hawaiian / Pacific Islander1,1620.3%
Two or More Races2,0600.6%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).