Maryland Dialing Codes, Country Codes and Area Codes
| City | Country Codes | Area Codes | Dialing Codes |
|---|---|---|---|
| Annapolis | +1 | 410 | +1 410 |
| Baltimore | +1 | 410 | +1 410 |
| Bethesda | +1 | 301 | +1 301 |
| Bowie | +1 | 301 | +1 301 |
| Catonsville | +1 | 443 | +1 443 |
| Clinton | +1 | 301 | +1 301 |
| Columbia | +1 | 803 | +1 803 |
| Dundalk | +1 | 443 | +1 443 |
| Ellicott City | +1 | 443 | +1 443 |
| Essex | +1 | 443 | +1 443 |
| Frederick | +1 | 301 | +1 301 |
| Gaithersburg | +1 | 240 | +1 240 |
| Germantown | +1 | 301 | +1 301 |
| Glen Burnie | +1 | 443 | +1 443 |
| Hagerstown | +1 | 301 | +1 301 |
| Montgomery Village | +1 | 301 | +1 301 |
| Olney | +1 | 301 | +1 301 |
| Parkville | +1 | 443 | +1 443 |
| Perry Hall | +1 | 410 | +1 410 |
| Pikesville | +1 | 443 | +1 443 |
| Potomac | +1 | 301 | +1 301 |
| Randallstown | +1 | 410 | +1 410 |
| Rockville | +1 | 301 | +1 301 |
| Severn | +1 | 443 | +1 443 |
| Severna Park | +1 | 443 | +1 443 |
| Silver Spring | +1 | 301 | +1 301 |
| Towson | +1 | 410 | +1 410 |
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