Find the last 4 digits (ZIP+4) for an address in 21104

ZIP 21104, Marriottsville, MD is filled in. Just type the street address.

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ZIP Code 21104 – Marriottsville, MD

Marriottsville, Maryland · Howard County · Eastern time

ZIP code21104
CityMarriottsville
StateMaryland
CountyHoward CountyCarroll CountyBaltimore County
Population6,052
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area17.05 sq mi
Center (lat, long)39.3469, -76.9128

Area codes in this area

410443667

These are the area codes that most often serve ZIP 21104 (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

21163 Woodstock · 3.5 mi21794 West Friendship · 4.4 mi21042 Ellicott City · 4.9 mi21723 Cooksville · 4.9 mi21784 Sykesville · 5 mi21133 Randallstown · 5.8 mi21244 Windsor Mill · 7.3 mi21136 Reisterstown · 7.3 mi

About ZIP 21104

ZIP code 21104 is assigned to Marriottsville, Maryland. It crosses 3 counties; most of its land is in Howard County. Its Census area covers about 17.05 square miles of land. The closest neighboring ZIP is 21163 (Woodstock), about 3.5 miles away.

Every address in 21104 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