Frederick, MD ZIP Codes, Area Codes and Address Format

City guides  |   |  2 min read

Frederick sits in Frederick County, Maryland. It uses 4 standard ZIP codes and the 227, 240 and 301 area codes.

State
Maryland (MD)
County
Frederick County
Standard ZIP codes
4
Time zone
Eastern

Frederick ZIP codes

These are the standard delivery ZIP codes for Frederick. The city has 6 ZIP codes in total when PO Box and unique codes are included.

  • 21701
  • 21702
  • 21703
  • 21704

Area codes in Frederick

Frederick phone numbers use 227, 240 and 301. With more than one code in use, residents on the same street can have different area codes.

Sample Frederick addresses

Susan Smith 1849 Mill Dr Frederick, MD 21704
Matthew Rodriguez 7954 Lake St Apt 8 Frederick, MD 21702

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Frederick

  • End the address with FREDERICK, MD and the five-digit ZIP code.
  • Put apartment or suite numbers at the end of the street line.
  • Use USPS abbreviations such as ST, AVE and BLVD.
  • Match the ZIP code to the street. Frederick has 4 codes, so the city name alone is not enough.

More Maryland cities

Bel Air, Waldorf, Columbia, Gaithersburg, Rockville, or see all Maryland cities.

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