04421 is zip code located in Castine, Maine. The population is 1,673, making 04421 the largest zipcode in Castine and the 10th largest in Hancock County.
There are 1 public schools in 04421 with an average Homefacts rating of A+. , and there are 0 registered sex offenders residing in the zip code 04421. Unemployment in 04421 is very high.
Zip codes within Castine include 04420.