ZIP code of Frederick (MD) is 21701. Below you can find map of Frederick, or look up other ZIP codes in Maryland or other US states. If Frederick's ZIP code is duplicated, and other places have same ZIP code number, you can use our ZIP code searcher by number 21701.
Frederick have more then one ZIP code. List of all Frederick's ZIP codes: 21701, 21702, 21703, 21704, 21705, 21709.