| 21901 North East | 410/443/667 | Cecil County | Maryland (MD) |
| 21901 Northeast | 410/443/667 | Cecil County | Maryland (MD) |
| 21902 Perry Point | 410/443/667 | Cecil County | Maryland (MD) |
| 21903 Perryville | 410/443/667 | Cecil County | Maryland (MD) |
| 21904 Bainbridge | 410/443/667 | Cecil County | Maryland (MD) |
| 21904 Port Deposit | 410/443/667 | Cecil County | Maryland (MD) |
| 21911 Rising Sun | 410/443/667 | Cecil County | Maryland (MD) |
| 21912 Warwick | 410/443/667 | Cecil County | Maryland (MD) |
| 21913 Cecilton | 410/443/667 | Cecil County | Maryland (MD) |
| 21914 Charlestown | 410/443/667 | Cecil County | Maryland (MD) |
| 21915 Chesapeake Cy | 410/443/667 | Cecil County | Maryland (MD) |
| 21915 Chesapeake City | 410/443/667 | Cecil County | Maryland (MD) |
| 21916 Childs | 410/443/667 | Cecil County | Maryland (MD) |
| 21917 Colora | 410/443/667 | Cecil County | Maryland (MD) |
| 21918 Conowingo | 410/443/667 | Cecil County | Maryland (MD) |
| 21919 Earleville | 410/443/667 | Cecil County | Maryland (MD) |
| 21920 Elk Mills | 410/443/667 | Cecil County | Maryland (MD) |
| 21921 Elkton | 410/443/667 | Cecil County | Maryland (MD) |
| 21922 Elkton | 410/443/667 | Cecil County | Maryland (MD) |
| 21930 Georgetown | 410/443/667 | Cecil County | Maryland (MD) |