Zip Code 94028 — Portola Valley, CA

ZIP Code 94028 is associated with Portola Valley, CA, in San Mateo County. The listed population estimate is 6,531; estimated density is 145.6 people per square mile. Among records with population estimates, it ranks #21 of 29 in San Mateo County and #1086 of 1,762 in CA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (37.374920, -122.211360)

Data MetricLocal Statistic
Postal / Zip Code94028
Primary CityPortola Valley
State / ProvinceCA
CountySan Mateo
Total Population6,531
Population Density145.6 people/sq mi
TimezoneAmerica/Los_Angeles

How 94028 Compares

MetricZIP 94028San Mateo County recordsCA records
Population estimate6,531713,109 (sum)39,286,245 (sum)
Population Density145.6 /sq mi----
County population rank#21 of 29----
State population rank#1086 of 1,762----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CA

ZIP CodeCityDistancePopulation estimate
ZIP 94304Palo Alto2.9 mi5,000
ZIP 94305Stanford3.6 mi18,509
ZIP 94022Los Altos3.9 mi20,027
ZIP 94306Palo Alto5.3 mi27,183
ZIP 94025Menlo Park5.5 mi40,721

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 →