03603 is zip code located in Charlestown, New Hampshire. The population is 5,364, making 03603 the largest zipcode in Charlestown and the 3rd largest in Sullivan County.
There are 3 public schools in 03603 with an average Homefacts rating of C. The total crime rate for Charlestown is very low , and there are 20 registered sex offenders residing in the zip code 03603. Unemployment in 03603 is low.