Find the last 4 digits (ZIP+4) for an address in 21791

ZIP 21791, Union Bridge, MD is filled in. Just type the street address.

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ZIP Code 21791 – Union Bridge, MD

Union Bridge, Maryland · Frederick County · Eastern time

ZIP code21791
CityUnion Bridge
StateMaryland
CountyFrederick CountyCarroll County
Population5,340
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area46.04 sq mi
Center (lat, long)39.5331, -77.1886

Area codes in this area

227240301

These are the area codes that most often serve ZIP 21791 (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

21792 Unionville · 4 mi21762 Libertytown · 4.8 mi21776 New Windsor · 4.8 mi21757 Keymar · 5.6 mi21798 Woodsboro · 5.7 mi21759 Ladiesburg · 6 mi21775 New Midway · 6.1 mi21793 Walkersville · 8.8 mi

About ZIP 21791

ZIP code 21791 is assigned to Union Bridge, Maryland. It crosses 2 counties; most of its land is in Frederick County. Its Census area covers about 46.04 square miles of land. The closest neighboring ZIP is 21792 (Unionville), about 4 miles away.

Every address in 21791 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