ZIP Code 91978

ZIP code 91978 is classified by USPS as a standard delivery area and covers roughly 17.4 square miles in Spring Valley, San Diego County, California. The area is home to 8,896 residents, producing a population density of 510 people per square mile, and falls within the Los Angeles time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 91978 against California and the nation.

On the economic side, the median household income for ZIP 91978 sits at $113,170 (11% above the California average), while per-capita income is $44,103. The poverty rate stands at 10.2% and the unemployment rate at 9.0%. On housing, the median home value is $637,200 (18% below the state average) with median rent at $2,327 per month, and 67.9% of occupied units are owner-occupied, a direct signal of whether 91978 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 31.3% of adults hold a bachelor's degree or higher, the median age is 42.5, and the average commute is 27 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing San Diego County, so you can benchmark 91978 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →