ZIP Code 78631

ZIP code 78631 is classified by USPS as a standard delivery area and covers roughly 855.4 square miles in Harper, Gillespie County, Texas. The area is home to 2,395 residents, producing a population density of 3 people per square mile, and falls within the Chicago time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 78631 against Texas and the nation.

On the economic side, the median household income for ZIP 78631 sits at $78,560 (4% above the Texas average), while per-capita income is $35,226. The poverty rate stands at 11.1% and the unemployment rate at 0.6%. On housing, the median home value is $351,600 (42% above the state average) with median rent at $1,304 per month, and 84.2% of occupied units are owner-occupied, a direct signal of whether 78631 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 24.0% of adults hold a bachelor's degree or higher, the median age is 43.4, and the average commute is —. We also surface 1 nearby ZIP codes within roughly 10 miles and 5 additional ZIPs sharing Gillespie County, so you can benchmark 78631 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 →