Find the last 4 digits (ZIP+4) for an address in 21788

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ZIP Code 21788 – Thurmont, MD

Thurmont, Maryland · Frederick County · Eastern time

ZIP code21788
CityThurmont
StateMaryland
CountyFrederick County
Population11,654
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area65.45 sq mi
Center (lat, long)39.5900, -77.4139

Area codes in this area

227240301

These are the area codes that most often serve ZIP 21788 (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

21778 Rocky Ridge · 4.9 mi21780 Sabillasville · 6.4 mi21775 New Midway · 6.6 mi21759 Ladiesburg · 6.7 mi21798 Woodsboro · 7.3 mi21702 Frederick · 7.8 mi21793 Walkersville · 7.9 mi21773 Myersville · 8 mi

About ZIP 21788

ZIP code 21788 is assigned to Thurmont, Maryland. It lies in Frederick County. Its Census area covers about 65.45 square miles of land. The closest neighboring ZIP is 21778 (Rocky Ridge), about 4.9 miles away.

Every address in 21788 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