Find the last 4 digits (ZIP+4) for an address in 21701

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ZIP Code 21701 – Frederick, MD

Frederick, Maryland · Frederick County · Eastern time

ZIP code21701
CityFrederick
StateMaryland
CountyFrederick County
Population43,048
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area39.7 sq mi
Center (lat, long)39.4436, -77.3329

Area codes in this area

227240301

These are the area codes that most often serve ZIP 21701 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

21793 Walkersville · 3.2 mi21709 Frederick · 3.6 mi21774 New Market · 3.9 mi21705 Frederick · 4.8 mi21762 Libertytown · 5.2 mi21702 Frederick · 6.4 mi21704 Frederick · 6.5 mi21798 Woodsboro · 6.8 mi

About ZIP 21701

ZIP code 21701 is assigned to Frederick, Maryland. It lies in Frederick County. Its Census area covers about 39.7 square miles of land. The closest neighboring ZIP is 21793 (Walkersville), about 3.2 miles away.

Every address in 21701 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources