ZIP code 91931

ZIP 91931 is a very small community in San Diego County, California, with 735 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #1475 of 1,803 ranked by population — larger than 18% of them. The median age here is 40 years against 39.1 nationally, a slightly older profile than the country as a whole. At this population the ACS sample is small, so the margin of error around every dollar figure below is wide — treat the numbers as a band, not a point, and expect them to move between annual releases without the place itself changing.

Households in ZIP 91931 earn a median of $49,808 a year, 36.6% below the national figure of $78,538. The median is the midpoint household, not an average, so a handful of very high earners cannot drag it upward the way they distort a mean. Poverty reaches 7.8% of residents here, below the 12.4% national rate.

The typical owner-occupied home in ZIP 91931 is valued at not published, while median gross rent runs not published a month. 78.2% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

With 735 residents, a handful of survey responses moves every median on this page. Compare ZIP 91931 against its county rather than against national figures.

The Census withheld home value, gross rent for ZIP 91931 because the sample was too thin to publish at this geography. Those values were suppressed at the source, not lost in our dataset, and we do not model a replacement. Everything else on this page comes straight from the ACS 2019-2023 ACS 5-year tables.

ZIP 91931 is tabulated inside San Diego County, California, one of 115 ZIP areas the Census publishes for that county and 1,803 across California. Fewer than 2,500 people are counted here, so the ZIP behaves like a village delivery route rather than a neighbourhood. County assignment on this page follows the largest share of the ZIP's land area, which matters where a delivery route crosses a county line: mail addressed to 91931 can be handled by a post office in a neighbouring county even though the tabulation area is filed here.

Against its own county, 91931 reports a median household income of $49,808, 51% below the $102,617 county median, and 45% below the $89,916 typical CA ZIP. Owner-occupied homes are valued at a median of not published. Rent is reported gross — the contract amount plus tenant-paid utilities — at not published a month, which is why it reads higher than the advertised rent on a listing for the same unit.

California charges 7.25% statewide, and local governments overlapping 91931 may add county, city or special-district levies on top. We publish the state floor for this ZIP rather than guessing a combined figure, because ZIP boundaries and taxing-district boundaries were drawn for different purposes and do not line up.

Everything above comes from the Census Bureau American Community Survey 2019-2023 ACS 5-year estimates for this ZIP Code Tabulation Area, with sales tax rates traced to the state revenue agency. Five-year estimates pool sixty months of responses, so they are stable enough to compare 91931 with its neighbours but always trail the current year, and any value the Census suppressed for sample size is shown as unpublished rather than filled in with a model.