ZIP Code 91931

ZIP code 91931 is classified by USPS as a standard delivery area and covers roughly 37.5 square miles in Guatay, San Diego County, California. The area is home to 592 residents, producing a population density of 16 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 91931 against California and the nation.

On the economic side, the median household income for ZIP 91931 sits at $63,750 (37% below the California average), while per-capita income is $34,239. The poverty rate stands at 3.6% and the unemployment rate at 0.0%. On housing, the median home value is — with median rent at — per month, and 81.4% of occupied units are owner-occupied, a direct signal of whether 91931 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 22.6% of adults hold a bachelor's degree or higher, the median age is 65.2, and the average commute is —. We also surface 3 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing San Diego County, so you can benchmark 91931 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 →