ZIP Code Tabulation Area · California

ZIP Code 94027: Atherton, CA

ZIP Code 94027 (Atherton, San Mateo County, California) has an estimated 7,002 residents in 2,236 households. The median household income is $250,000+, the median home value is $2,000,000+ and the median gross rent is $3,500/mo+. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Total population

7,002

Margin of error ±25

Median household income

$250,000+

Margin of error not available

Median home value

$2,000,000+

Margin of error not available

Median gross rent

$3,500/mo+

Margin of error not available

Median age

49.1 yrs

Margin of error ±2.7 yrs

Mean travel time to work

23.1 min

Margin of error ±5.5 min

How ZIP 94027 compares with California and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 9402749.1 yrsCalifornia37.9 yrsUnited States38.9 yrs

Median household income

ZIP 94027$250,000+California$99,122United States$80,734

Per capita income

ZIP 94027$188,761California$49,513United States$44,673

Poverty rate

ZIP 940275.3%California12.0%United States12.5%

Unemployment rate

ZIP 940273.2%California6.6%United States5.2%

Bachelor's degree or higher

ZIP 9402783.2%California37.1%United States35.7%

Median home value

ZIP 94027$2,000,000+California$734,700United States$332,700

Median gross rent

ZIP 94027$3,500/mo+California$2,036/moUnited States$1,413/mo

Owner-occupied homes

ZIP 9402787.6%California55.9%United States65.2%

Mean travel time to work

ZIP 9402723.1 minCalifornia28.7 minUnited States26.4 min

Worked from home

ZIP 9402740.6%California17.2%United States15.1%

All figures for ZIP 94027

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 94027 — ACS 2020–2024 5-year estimates
MeasureZIP 94027Margin of errorCaliforniaUnited States
Total population7,002±2539,287,377334,922,499
Median age49.1 yrs±2.7 yrs37.9 yrs38.9 yrs
Households2,236±12913,548,091129,227,496
Median household income$250,000+—$99,122$80,734
Per capita income$188,761±$22,192$49,513$44,673
Poverty rate5.3%±3.4 pts12.0%12.5%
Unemployment rate3.2%±1.9 pts6.6%5.2%
Bachelor's degree or higher83.2%±6.6 pts37.1%35.7%
Median home value$2,000,000+—$734,700$332,700
Median gross rent$3,500/mo+—$2,036/mo$1,413/mo
Owner-occupied homes87.6%±3.8 pts55.9%65.2%
Mean travel time to work23.1 min±5.5 min28.7 min26.4 min
Worked from home40.6%±6.3 pts17.2%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 94027
GroupZIP 94027CaliforniaUnited States
White alone, not Hispanic or Latino62.1%33.8%57.4%
Black or African American alone, not Hispanic or Latino0.9%5.2%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.3%0.5%
Asian alone, not Hispanic or Latino17.9%15.3%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.0%0.3%0.2%
Some other race alone, not Hispanic or Latino0.4%0.6%0.6%
Two or more races, not Hispanic or Latino4.5%4.4%4.3%
Hispanic or Latino (of any race)14.2%40.2%19.3%

Where ZIP 94027 is

State
California
Main county
San Mateo County
Largest overlapping place
Atherton (100% of the ZIP's land area)
Land area
5.03 sq mi· about 1,392 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in San Mateo County

94002 Belmont, CA94005 Brisbane, CA94010 Hillsborough, CA94014 Daly City, CA94015 Daly City, CA94018 El Granada, CA94019 San Mateo County, CA94020 San Mateo County, CA94021 San Mateo County, CA94025 Menlo Park, CA94028 Portola Valley, CA94030 Millbrae, CA94037 Montara, CA94038 Moss Beach, CA94044 Pacifica, CA94060 San Mateo County, CA94061 Redwood City, CA94062 San Mateo County, CA94063 Redwood City, CA94065 Redwood City, CA94066 San Bruno, CA94070 San Carlos, CA94074 San Mateo County, CA94080 South San Francisco, CA

See every ZIP code in California, or compare ZIP 94027 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.