ZIP Code 18631

ZIP code 18631 is classified by USPS as a standard delivery area and covers roughly 4.4 square miles in Mifflinville, Columbia County, Pennsylvania. The area is home to 1,286 residents, producing a population density of 289 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 18631 against Pennsylvania and the nation.

On the economic side, the median household income for ZIP 18631 sits at $46,125 (41% below the Pennsylvania average), while per-capita income is $29,601. The poverty rate stands at 14.2% and the unemployment rate at 0.0%. On housing, the median home value is $214,100 (6% below the state average) with median rent at $959 per month, and 78.3% of occupied units are owner-occupied, a direct signal of whether 18631 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 29.6% of adults hold a bachelor's degree or higher, the median age is 47, and the average commute is —. We also surface 8 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Columbia County, so you can benchmark 18631 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 →