ZIP Code 21639

ZIP code 21639 is classified by USPS as a standard delivery area and covers roughly 85.1 square miles in Greensboro, Caroline County, Maryland. The area is home to 4,408 residents, producing a population density of 52 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 21639 against Maryland and the nation.

On the economic side, the median household income for ZIP 21639 sits at $62,772 (45% below the Maryland average), while per-capita income is $33,990. The poverty rate stands at 10.3% and the unemployment rate at 2.1%. On housing, the median home value is $269,400 (40% below the state average) with median rent at $1,107 per month, and 72.2% of occupied units are owner-occupied, a direct signal of whether 21639 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 13.5% of adults hold a bachelor's degree or higher, the median age is 37.7, and the average commute is 39 minutes. We also surface 7 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Caroline County, so you can benchmark 21639 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 →