ZIP Code 04421

ZIP code 04421 is classified by USPS as a standard delivery area and covers roughly 20.1 square miles in Castine, Hancock County, Maine. The area is home to 1,366 residents, producing a population density of 68 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 04421 against Maine and the nation.

On the economic side, the median household income for ZIP 04421 sits at $113,750 (55% above the Maine average), while per-capita income is $39,304. The poverty rate stands at 14.1% and the unemployment rate at 2.7%. On housing, the median home value is $603,500 (113% above the state average) with median rent at $1,105 per month, and 80.4% of occupied units are owner-occupied, a direct signal of whether 04421 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 74.5% of adults hold a bachelor's degree or higher, the median age is 21.2, and the average commute is —. We also surface 8 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Hancock County, so you can benchmark 04421 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 →