21042 is zip code located in Ellicott City, Maryland. The population is 39,556, making 21042 the 2nd largest zipcode in Ellicott City and the 4th largest in Howard County.
There are 13 public schools in 21042 with an average Homefacts rating of A+. , and there are 14 registered sex offenders residing in the zip code 21042. Unemployment in 21042 is moderate.