20646 is zip code located in La Plata, Maryland. The population is 18,866, making 20646 the largest zipcode in La Plata and the 4th largest in Charles County.
There are 5 public schools in 20646 with an average Homefacts rating of A-. The total crime rate for La Plata is very low , and there are 27 registered sex offenders residing in the zip code 20646. Unemployment in 20646 is very high.