Residential delivery area · California
ZIP Code 94027: Atherton, CA
ZIP code 94027 is in Atherton, California, entirely in San Mateo County (Census 2020 ZIP-county file). About 7,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $250,000 or more (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2013
- ZBP2023
- IRS2022
- Town
- Atherton · its only residential ZIP
- County
- San Mateo County
- Census places
- Atherton
- Neighborhood
- Lindenwood GeoNames
- Metro area
- San Francisco-Oakland-Fremont, CA
- House districts
- CA-16 (98%), CA-15 (2%) 119th Congress, by share of land
- State
- California
- Time zone
- Pacific
- Land area
- 5.0 sq mi · 1,393 people per sq mi
Where is ZIP code 94027?
94027 centers on 37.457°, -122.201° and covers 5.0 square miles of land plus 0.0 of water. It borders 4 ZIP codes: 94025, 94061, 94063, 94062.
The map draws ZIP code areas only. For the streets inside 94027, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 94027 compare with the rest of San Mateo County?
| Measure | 94027 | In San Mateo County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 7,002 | 21st of 31 | 1,077th of 1,802 |
| Median household income | $250k+ | 1= of 23 | 1= of 1,189 |
| Median home value | $2M+ | 1= of 27 | 1= of 1,317 |
1= means a shared first place: 94027's median household income ties with 2 other ZIP codes at the Census cap in San Mateo County; median household income ties with 11 other ZIP codes at the Census cap in California; median home value ties with 7 other ZIP codes at the Census cap in San Mateo County; median home value ties with 61 other ZIP codes at the Census cap in California.
Its median household income is at the Census cap of $250,000 or more, like 117 other U.S. residential ZIP codes (69 of the 118 are large enough to rank), and it is denser than 81% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 94027?
The 2020 Census counted 7,270 people in 94027; the ACS, which samples households over 2020-2024, estimates 7,002. Between the 2010 and 2020 censuses its population grew 2.6% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 7,002
- 2020 Census count
- 7,270+2.6% since 2010 (7,089)
- Households
- 2,236
- Median age
- 49.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 94027?
Of the 7,002 people the ACS estimates in 94027, 18.4% are under 18 and 25.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (62.1%), then Asian (not Hispanic) (17.9%).
- Under 1818.4%
- 18 to 6455.9%
- 65 and older25.7%
- White, not Hispanic62.1%
- Asian, not Hispanic17.9%
- Hispanic or Latino14.2%
- Other or two or more4.9%
- Black, not Hispanic0.9%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 94027 earn?
Median household income is $250,000 or more (ACS 2020-2024), the highest of the 23 ranked ZIP codes in San Mateo County.
By IRS adjusted gross income per tax return ($1,587,518, 2022), 94027 ranks 6th in the U.S. among ZIP codes of 1,000+ people with 200+ returns and at most 1.5 returns per household (see the ranking).
- Median household income
- $250,000 or more
- Income per person
- $188,761
- Below the poverty line
- 5.3%
- Unemployed (of the labor force)
- 3.2%
- Adults 25+ with a bachelor's degree
- 83.2%
- Adjusted gross income per tax return, 2022
- $1,587,5183,050 returns; wages 36% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 94027?
- Median home value (owners' estimate)
- $2,000,000 or more
- Median gross rent
- $3,500 or more
- Homes owned by their occupants
- 87.6%
- Housing units
- 2,676
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 94027?
180 business establishments had a location in this ZIP code in 2023, 12 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services42
- Real estate and rental and leasing27
- Finance and insurance23
- Health care and social assistance20
- Other services (except public administration)15
- Information8
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 94027?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94025 | Menlo Park | 40,721 | $217k | 1.1 mi |
| 94061 | Redwood City | 37,048 | $146k | 2.0 mi |
| 94063 | Redwood City | 34,433 | $117k | 2.5 mi |
| 94062 | Redwood City | 25,759 | $233k | 5.2 mi |
| 94301 | Palo Alto | 17,508 | $242k | 2.9 mi (near) |
| 94305 | Stanford | 18,509 | $83k | 3.2 mi (near) |
| 94304 | Palo Alto | 5,000 | $154k | 4.5 mi (near) |
| 94303 | Palo Alto | 46,879 | $152k | 4.7 mi (near) |
| 94070 | San Carlos | 30,447 | $240k | 4.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.