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Zip Code 94587 — Union City, CA

94587 is a ZIP Code associated with Union City, CA, located within Alameda. 94587 ranks #5 out of 49 ZIP codes in Alameda County by population (and #73 out of 1,802 in CA). The area supports an estimated population of 67,464 residents across Data Pending housing units, with a population density of 1,326.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (37.591420, -122.069930)

Data MetricLocal Statistic
Postal / Zip Code94587
Primary CityUnion City
State / ProvinceCA
CountyAlameda
Total Population67,464
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1,326.9 people/sq mi
TimezoneAmerica/Los_Angeles

How 94587 Compares

MetricZIP 94587Alameda CountyCA State Average
Population67,4641,668,635 (Total)39,286,245 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density1,326.9 /sq mi----
County Pop Rank#5 of 49----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 94555Fremont2.9 mi37,501N/A
Zip 94544Hayward3.0 mi76,947N/A
Zip 94545Hayward3.8 mi32,843N/A
Zip 94536Fremont4.8 mi70,619N/A
Zip 94542Hayward5.0 mi14,871N/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 →