21139 ZIP Code — Riderwood, MD
Baltimore County, Maryland
ZIP code 21139 is located in Riderwood, Maryland, within Baltimore County. It covers approximately 0.00 square miles and serves a population of 0 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/443/667.
0
population
0.00
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
21139 ZIP code map
Cities in ZIP code 21139
Below are the cities the US Postal Service accepts for ZIP code 21139. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Riderwood | Acceptable |
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 0 |
| Population density | 0 / sq mi |
| State FIPS | 24 |
| County FIPS | 005 |
| Geography | |
|---|---|
| Land area | 0.00 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 39.4095 |
| Longitude | -76.6487 |
| Timezone | Eastern (ET) |
| Area code | 410/443/667 |