20657 is zip code located in Lusby, Maryland. The population is 20,538, making 20657 the largest zipcode in Lusby and the largest in Calvert County.
There are 5 public schools in 20657 with an average Homefacts rating of A-. , and there are 51 registered sex offenders residing in the zip code 20657. Unemployment in 20657 is moderate.