ZIP Code 21778

ZIP code 21778 is classified by USPS as a standard delivery area and covers roughly 45.4 square miles in Rocky Ridge, Frederick County, Maryland. The area is home to 1,094 residents, producing a population density of 24 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 21778 against Maryland and the nation.

On the economic side, the median household income for ZIP 21778 sits at $76,458 (33% below the Maryland average), while per-capita income is $54,798. The poverty rate stands at 0.9% and the unemployment rate at 6.5%. On housing, the median home value is $382,100 (15% below the state average) with median rent at — per month, and 81.3% of occupied units are owner-occupied, a direct signal of whether 21778 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 27.0% of adults hold a bachelor's degree or higher, the median age is 58.4, and the average commute is —. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Frederick County, so you can benchmark 21778 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 →