ZIP Code 21139
Riderwood, Maryland
ZIP Code Information
ZIP code 21139 identifies a postal delivery area inside Riderwood, Maryland. The ZIP lies within Baltimore County. Clocks here follow the America/New_York time zone (UTC-4).
What you can do with ZIP code 21139
- Write a mailing address: Riderwood, MD 21139. The ZIP goes last, after the state abbreviation.
- Check whether a shipping or delivery quote applies to this area — most US carriers price by ZIP code rather than by city.
- Look up the local time zone before scheduling a call — the ZIP tells you which zone applies to that address.
- Compare the ZIP with neighbouring codes to see how population and income shift block by block.
Location Map
Full mapNearby ZIP Codes
Radius search| ZIP Code | City | Distance | |
|---|---|---|---|
| 21022 | Brooklandville | 2.4 km | Distance |
| 21093 | Lutherville Timonium | 2.7 km | Distance |
| 21204 | Towson | 3.9 km | Distance |
| 21285 | Towson | 4.1 km | Distance |
| 21284 | Towson | 4.1 km | Distance |
| 21252 | Towson | 4.1 km | Distance |
| 21209 | Baltimore | 4.7 km | Distance |
| 21153 | Stevenson | 5.5 km | Distance |
| 21094 | Lutherville Timonium | 5.9 km | Distance |
| 21251 | Baltimore | 5.9 km | Distance |
Nearby Cities
Brooklandville, Maryland
(2.4 km)
Lutherville Timonium, Maryland
(2.7 km)
Towson, Maryland
(3.9 km)
Baltimore, Maryland
(4.7 km)
Stevenson, Maryland
(5.5 km)
Frequently Asked Questions
ZIP code 21139 is located in Riderwood, Maryland.
ZIP code 21139 is in Baltimore county, Maryland.
ZIP code 21139 is in the America/New_York timezone.