Postal reference / United States
21012Arnold, Maryland
ZIP code 21012 is a United States postal code for Arnold, Maryland. Its county association is Anne Arundel County. The map reference point is at 39.0476, -76.4941.
- State / territory
- Maryland
- Recorded place name
- Arnold
- County association
- Anne Arundel
- Estimated coordinate
- 39.0476, -76.4941
View on OpenStreetMap - ZIP prefix
- 210 · 58 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Area
- Land area
- 9.779 sq mi (2023 Census Gazetteer)
Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.
Need the last four digits?
ZIP+4 depends on the full delivery address. A five-digit code alone cannot determine its extension.
Find ZIP+4Explore Maryland
Browse the other 604 ZIP codes recorded for Maryland, sorted by code with place and county.
Maryland directoryNearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 21409 | Annapolis | MD | Anne Arundel | 3.1 |
| 21405 | Annapolis | MD | Anne Arundel | 3.3 |
| 21056 | Gibson Island | MD | Anne Arundel | 3.8 |
| 21146 | Severna Park | MD | Anne Arundel | 4.1 |
| 21402 | Annapolis | MD | Anne Arundel | 4.4 |
| 21404 | Annapolis | MD | Anne Arundel | 4.8 |
| 21401 | Annapolis | MD | Anne Arundel | 5.0 |
| 21122 | Pasadena | MD | Anne Arundel | 5.0 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
Verify a mailing address
For mailing, confirm the complete street or PO Box address with USPS. A place record does not confirm delivery eligibility or the ZIP+4 extension.
Open USPS address lookup