City · Maryland · United States
Riderwood, MD — ZIP codes
1 ZIP code · Baltimore County
- City
- Riderwood
- County
- Baltimore
- State
- Maryland
- Country
- United States
- Postal code
- 21139Single source
- Coordinates
- 39.4093, -76.6486 View on OpenStreetMap
- Area codes
- 410, 443, 667 (from the nearest rate centre)
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 21139 | Riderwood | Single source |
Sources and verification
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. Last generated : 2026-08-21. Report an error.