Find the last 4 digits (ZIP+4) for an address in 21139

ZIP 21139, Riderwood, MD is filled in. Just type the street address.

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ZIP Code 21139 – Riderwood, MD

Riderwood, Maryland · Baltimore County · Eastern time

ZIP code21139
CityRiderwood
StateMaryland
CountyBaltimore County
PopulationNot published (no Census ZIP area)
Time zoneEastern · local time
ZIP typePO box or unique ZIP (no Census area)
Center (lat, long)39.4093, -76.6486

Area codes in this area

410443667

These are the area codes that most often serve ZIP 21139 (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

21204 Towson · 1.2 mi21022 Brooklandville · 1.5 mi21093 Lutherville Timonium · 2 mi21252 Towson · 2.2 mi21285 Towson · 2.3 mi21209 Baltimore · 2.5 mi21284 Towson · 2.5 mi21153 Stevenson · 2.8 mi

About ZIP 21139

ZIP code 21139 is assigned to Riderwood, Maryland. It lies in Baltimore County. It is a PO-box-only or single-address ZIP, so the Census Bureau does not publish an area for it; the location shown is approximate. The closest neighboring ZIP is 21204 (Towson), about 1.2 miles away.

Every address in 21139 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