ZIP code · Atherton · California · United States
ZIP code 94027 — Atherton
ZIP code 94027 serves Atherton, California.
- Postal code
- 94027Single source Value from one source, not cross-checked.
- City
- Atherton
- County
- San Mateo FIPS 06081
- State
- California
- Country
- United States
- Coordinates
- 37.4563, -122.2002 — precision precise (locality)
View on OpenStreetMap - Population
- 7,030 (ZCTA, ACS 5-year)
- Population density
- 1,398 / sq mi
- Land area
- 5 sq mi (13 km²) (ZCTA, ACS 5-year)
- Median household income
- $250,000+
- Per-capita income
- $203,239
- Median age
- 49.1
- Households
- 2,275
- Housing units
- 2,682
- Median home value
- $2,000,000+
- Median gross rent
- $3,500+ / month
- Congressional districts
- CA-16 (also CA-15) (119th Congress)
- USDA hardiness zone
- 9b (25 to 30 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 650 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 94027 with another ZIP · ZIPs within 25 miles · distance from 94027
Map of ZIP code 94027
Climate — monthly normals
Warmest month Jul (avg high 81°F), coldest Dec (avg low 40°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 59 | 62 | 65 | 69 | 73 | 79 | 81 | 81 | 79 | 75 | 65 | 59 |
| Avg low °F | 41 | 43 | 45 | 47 | 50 | 54 | 57 | 57 | 54 | 50 | 44 | 40 |
| Precip in | 3.8 | 3.6 | 3.0 | 1.1 | 0.5 | 0.2 | 0.0 | 0.0 | 0.1 | 0.9 | 1.9 | 3.9 |
NOAA 1991–2020 climate normals from the nearest station: REDWOOD CITY (2.5 mi) · NOAA NCEI
Places in ZIP 94027
- 8 schools
- 1 colleges & universities
- 4 parks
- 6 playgrounds
- 6 gyms & sports centres
- 2 libraries
- 1 post offices
- 1 EV charging stations
- 2 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page