21104 is zip code located in Marriottsville, Maryland. The population is 5,018, making 21104 the largest zipcode in Marriottsville and the 9th largest in Howard County.
There are 2 public schools in 21104 with an average Homefacts rating of A+. , and there are 1 registered sex offenders residing in the zip code 21104. Unemployment in 21104 is moderate.