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Frederick, Maryland Area Codes - Click here for City Guide
| Area Code Directory | | Zip Code | City | State | County | Area Code | Time Zone | Latitude/Longitude | | 21701 | Frederick | MD | Frederick | 301 | EST | 39.439301/-77.342796 | | 21702 | Frederick | MD | Frederick | 301 | EST | 39.478001/-77.456100 | | 21703 | Frederick | MD | Frederick | 301 | EST | 39.375599/-77.469299 | | 21704 | Frederick | MD | Frederick | 301 | EST | 39.347401/-77.371399 | | 21705 | Frederick | MD | Frederick | 301 | EST | 39.413799/-77.408203 | | 21709 | Frederick | MD | Frederick | 301 | EST | 39.428101/-77.416901 |
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