| Locality | Post Code |
|---|---|
| Bainbridge, Cecil | 21904 |
| Cecilton, Cecil | 21913 |
| Charlestown, Cecil | 21914 |
| Chesapeake City, Cecil | 21915 |
| Childs, Cecil | 21916 |
| Colora, Cecil | 21917 |
| Conowingo, Cecil | 21918 |
| Earleville, Cecil | 21919 |
| Elk Mills, Cecil | 21920 |
| Elkton, Cecil | 21921 |
| Georgetown, Cecil | 21930 |
| North East, Cecil | 21901 |
| Perry Point, Cecil | 21902 |
| Perryville, Cecil | 21903 |
| Port Deposit, Cecil | 21904 |
| Rising Sun, Cecil | 21911 |
| Warwick, Cecil | 21912 |