ZIP code · Riderwood · Maryland · United States

ZIP code 21139 — Riderwood

Name: Riderwood (21139)
Address: Maryland, 21139, US

ZIP code 21139 serves Riderwood, Maryland.

Postal code: 21139
Single source Value from one source, not cross-checked.
City: Riderwood
County: Baltimore
State: Maryland
Country: United States
Coordinates: 39.4093, -76.6486 — precision precise (locality)
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Nearby localities

21022Brooklandville · 2.4 km
21093Lutherville Timonium · 2.7 km
21204Towson · 3.9 km
21252Towson · 4.1 km
21284Towson · 4.1 km
21285Towson · 4.1 km
21209Baltimore · 4.7 km
21153Stevenson · 5.5 km
21251Baltimore
21094Lutherville Timonium · 5.9 km

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames. Data generated on 2026-08-21. Methodology · Report an error on this page