410 Area Code
The 410 area code is used by SOME cities and towns in these Counties / Independent Cities:
| Anne Arundel County | Cities & Towns | ZIP Codes | Features |
| Baltimore County | Cities & Towns | ZIP Codes | Features |
| Baltimore City County | Cities & Towns | ZIP Codes | Features |
| Calvert County | Cities & Towns | ZIP Codes | Features |
| Caroline County | Cities & Towns | ZIP Codes | Features |
| Carroll County | Cities & Towns | ZIP Codes | Features |
| Cecil County | Cities & Towns | ZIP Codes | Features |
| Dorchester County | Cities & Towns | ZIP Codes | Features |
| Harford County | Cities & Towns | ZIP Codes | Features |
| Howard County | Cities & Towns | ZIP Codes | Features |
| Kent County | Cities & Towns | ZIP Codes | Features |
| Queen Annes County | Cities & Towns | ZIP Codes | Features |
| Somerset County | Cities & Towns | ZIP Codes | Features |
| Talbot County | Cities & Towns | ZIP Codes | Features |
| Wicomico County | Cities & Towns | ZIP Codes | Features |
| Worcester County | Cities & Towns | ZIP Codes | Features |
