Find the last 4 digits (ZIP+4) for an address in 21045

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ZIP Code 21045 – Columbia, MD

Columbia, Maryland · Howard County · Eastern time

ZIP code21045
CityColumbia
StateMaryland
CountyHoward County
Population40,034
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area9.7 sq mi
Center (lat, long)39.2060, -76.8282

Area codes in this area

410443667

These are the area codes that most often serve ZIP 21045 (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

21046 Columbia · 2.2 mi21044 Columbia · 2.7 mi21043 Ellicott City · 3.7 mi21075 Elkridge · 4.1 mi20794 Jessup · 4.2 mi20763 Savage · 4.8 mi20723 Laurel · 5.2 mi20701 Annapolis Junction · 5.5 mi

About ZIP 21045

ZIP code 21045 is assigned to Columbia, Maryland. It lies in Howard County. Its Census area covers about 9.7 square miles of land. The closest neighboring ZIP is 21046 (Columbia), about 2.2 miles away.

Every address in 21045 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