ZIP Code 21655

ZIP code 21655 is classified by USPS as a standard delivery area and covers roughly 137.2 square miles in Preston, Caroline County, Maryland. The area is home to 5,009 residents, producing a population density of 37 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 21655 against Maryland and the nation.

On the economic side, the median household income for ZIP 21655 sits at $90,385 (21% below the Maryland average), while per-capita income is $42,506. The poverty rate stands at 4.3% and the unemployment rate at 3.1%. On housing, the median home value is $289,200 (35% below the state average) with median rent at $1,380 per month, and 84.0% of occupied units are owner-occupied, a direct signal of whether 21655 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 42.2, and the average commute is 29 minutes. We also surface 6 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Caroline County, so you can benchmark 21655 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 →