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Zip Code 92078 — San Marcos, CA

92078 is a ZIP Code associated with San Marcos, CA, located within San Diego. 92078 ranks #18 out of 115 ZIP codes in San Diego County by population (and #184 out of 1,802 in CA). The area supports an estimated population of 53,605 residents across Data Pending housing units, with a population density of 1,239.3 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (33.118340, -117.185540)

Data MetricLocal Statistic
Postal / Zip Code92078
Primary CitySan Marcos
State / ProvinceCA
CountySan Diego
Total Population53,605
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1,239.3 people/sq mi
TimezoneAmerica/Los_Angeles

How 92078 Compares

MetricZIP 92078San Diego CountyCA State Average
Population53,6053,322,512 (Total)39,286,245 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density1,239.3 /sq mi----
County Pop Rank#18 of 115----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 92096San Marcos1.8 miN/AN/A
Zip 92009Carlsbad3.8 mi44,739N/A
Zip 92029Escondido4.0 mi20,726N/A
Zip 92069San Marcos4.3 mi47,335N/A
Zip 92081Vista4.5 mi29,002N/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 →