21555 is zip code located in Oldtown, Maryland. The population is 1,590, making 21555 the largest zipcode in Oldtown and the 8th largest in Allegany County.
There are 0 public schools in 21555 with an average Homefacts rating of NA. , and there are 3 registered sex offenders residing in the zip code 21555. Unemployment in 21555 is high.