20878 is zip code located in Gaithersburg, Maryland. The population is 62,983, making 20878 the largest zipcode in Gaithersburg and the 2nd largest in Montgomery County.
There are 9 public schools in 20878 with an average Homefacts rating of A-. , and there are 24 registered sex offenders residing in the zip code 20878. Unemployment in 20878 is moderate.