Find the last 4 digits (ZIP+4) for an address in 21770

ZIP 21770, Monrovia, MD is filled in. Just type the street address.

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ZIP Code 21770 – Monrovia, MD

Monrovia, Maryland · Frederick County · Eastern time

ZIP code21770
CityMonrovia
StateMaryland
CountyFrederick County
Population8,751
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area11.45 sq mi
Center (lat, long)39.3502, -77.2562

Area codes in this area

227240301

These are the area codes that most often serve ZIP 21770 (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

21754 Ijamsville · 3.4 mi21774 New Market · 4.2 mi20872 Damascus · 4.4 mi21771 Mount Airy · 6.1 mi21704 Frederick · 6.4 mi20871 Clarksburg · 6.4 mi21701 Frederick · 7.6 mi21762 Libertytown · 9 mi

About ZIP 21770

ZIP code 21770 is assigned to Monrovia, Maryland. It lies in Frederick County. Its Census area covers about 11.45 square miles of land. The closest neighboring ZIP is 21754 (Ijamsville), about 3.4 miles away.

Every address in 21770 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