California Assembly District 21

State Legislative District Profile (Lower Chamber)

Overview

District ID
ca-hd-021
State
California
Chamber
Lower chamber
District Code
021
Land Area
92.5 sq mi
Water Area
100.4 sq mi

Boundary

Boundary of California Assembly District 21

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
San Mateo County92.55 sq mi100.0%20.6%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Redwood City city19.34 sq mi20.9%100.0%
San Mateo city12.13 sq mi13.1%100.0%
South San Francisco city6.28 sq mi6.8%68.2%
Hillsborough town6.17 sq mi6.7%100.0%
San Carlos city5.41 sq mi5.8%100.0%
San Bruno city5.24 sq mi5.7%95.5%
Menlo Park city5.00 sq mi5.4%50.1%
Belmont city4.63 sq mi5.0%100.0%
Burlingame city4.39 sq mi4.7%100.0%
Foster City city3.79 sq mi4.1%100.0%
Millbrae city3.27 sq mi3.5%100.0%
Brisbane city2.99 sq mi3.2%99.9%
East Palo Alto city2.53 sq mi2.7%100.0%
Highlands CDP1.30 sq mi1.4%100.0%
North Fair Oaks CDP1.19 sq mi1.3%99.8%
Emerald Lake Hills CDP1.18 sq mi1.3%100.0%
Baywood Park CDP0.55 sq mi0.6%100.0%
Atherton town0.08 sq mi0.1%1.5%

Showing all 18 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 15493,022100.0%65.0%99.9%
CA District 1600.0%0.0%0.1%

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

Demographics

Total Population
479,435 (± 2,166)
Median Age
39.4
Median Household Income
$162,705 (± $4,367)
High School Graduate or Higher (age 25+)
89.9%
Bachelor's Degree or Higher (age 25+)
55.5%

Population by Age

GroupPeopleShare
Under 1898,75520.6%
18 to 64303,80363.4%
65 and over76,87716.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)133,73727.9%
White, not Hispanic166,62834.8%
Black, not Hispanic10,3652.2%
Asian, not Hispanic131,00127.3%
American Indian / Alaska Native, not Hispanic5900.1%
Native Hawaiian / Pacific Islander, not Hispanic6,2731.3%
Some other race, not Hispanic5,1421.1%
Two or more races, not Hispanic25,6995.4%

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
397,834
Citizen Voting Age Population (CVAP)
304,605

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic299,54575.3%
Hispanic98,29024.7%
White163,26741.0%
Black10,4232.6%
Asian100,36925.2%
American Indian / Alaska Native5470.1%
Native Hawaiian / Pacific Islander5,4671.4%
Two or More Races3,1100.8%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic239,40078.6%
Hispanic65,20821.4%
White138,47645.5%
Black10,1173.3%
Asian83,56227.4%
American Indian / Alaska Native1,3980.5%
Native Hawaiian / Pacific Islander4,0361.3%
Two or More Races2,0370.7%

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