ZIP Code 21723

ZIP code 21723 is classified by USPS as a standard delivery area and covers roughly 7.9 square miles in Cooksville, Howard County, Maryland. The area is home to 803 residents, producing a population density of 102 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 21723 against Maryland and the nation.

On the economic side, the median household income for ZIP 21723 sits at $241,250 (111% above the Maryland average), while per-capita income is $72,952. The poverty rate stands at 0.0% and the unemployment rate at 0.0%. On housing, the median home value is $1,005,500 (125% above the state average) with median rent at — per month, and 95.3% of occupied units are owner-occupied, a direct signal of whether 21723 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 82.3% of adults hold a bachelor's degree or higher, the median age is 48.3, and the average commute is —. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Howard County, so you can benchmark 21723 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 →