21771 is zip code located in Mount Airy, Maryland. The population is 29,101, making 21771 the largest zipcode in Mount Airy and the 4th largest in Frederick County.
There are 4 public schools in 21771 with an average Homefacts rating of A. The total crime rate for Mount Airy is very low , and there are 17 registered sex offenders residing in the zip code 21771. Unemployment in 21771 is moderate.