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Zip Code 94027 — Atherton, CA

94027 is a ZIP Code associated with Atherton, CA, located within San Mateo. The postal region supports an estimated population of 7,002 residents across Data Pending housing units, with a population density of 537.8 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (37.453990, -122.203130)

Data Metric	Local Statistic
Postal / Zip Code	94027
Primary City	Atherton
State / Province	CA
County	San Mateo
Total Population	7,002
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	537.8 people/sq mi
Timezone	America/Los_Angeles

How 94027 Compares

Metric	ZIP 94027	San Mateo County	CA State Average
Population	7,002	713,109	39,286,245
Median Income	Data Pending	N/A	N/A
Population Density	537.8 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 94025	Menlo Park	1.1 mi	40,721	N/A
Zip 94061	Redwood City	1.9 mi	37,048	N/A
Zip 94063	Redwood City	2.8 mi	34,433	N/A
Zip 94301	Palo Alto	3.0 mi	17,508	N/A
Zip 94305	Stanford	3.2 mi	18,509	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →