| City/Town | No. of Mailboxes | UPS Mailboxes |
|---|---|---|
| Wilmington | 259 | 9 |
| Newark | 81 | 2 |
| Dover | 48 | 1 |
| New Castle | 46 | 2 |
| Talleyville | 29 | 0 |
| Seaford | 21 | 1 |
| Bear | 17 | 2 |
| Lewes | 17 | 1 |
| Milford | 17 | 1 |
| Newport | 16 | 0 |
| Middletown | 15 | 1 |
| Rehoboth Beach | 15 | 2 |
| Millsboro | 14 | 1 |
| Selbyville | 13 | 1 |
| Georgetown | 11 | 1 |
| Hockessin | 11 | 1 |
| Bethany Beach | 9 | 1 |
| Claymont | 9 | 1 |
| Ocean View | 8 | 1 |
| Smyrna | 8 | 1 |
| Delmar | 7 | 1 |
| Laurel | 7 | 1 |
| Bridgeville | 6 | 1 |
| Milton | 6 | 1 |
| Camden Wyoming | 5 | 1 |
| Felton | 5 | 1 |
| Frankford | 5 | 2 |
| Frederica | 5 | 1 |
| Harrington | 5 | 1 |
| Lincoln | 5 | 1 |
| Magnolia | 5 | 1 |
| Nassau | 5 | 1 |
| Townsend | 5 | 1 |
| Bethel | 4 | 1 |
| Cheswold | 4 | 1 |
| Clayton | 4 | 1 |
| Delaware City | 4 | 1 |
| Ellendale | 4 | 1 |
| Greenwood | 4 | 1 |
| Hartly | 4 | 1 |
| Houston | 4 | 1 |
| Kenton | 4 | 1 |
| Little Creek | 4 | 1 |
| Montchanin | 4 | 1 |
| Odessa | 4 | 1 |
| Port Penn | 4 | 1 |
| Rockland | 4 | 1 |
| Saint Georges | 4 | 1 |
| Viola | 4 | 1 |
| Woodside | 4 | 1 |
| Yorklyn | 4 | 1 |
| Kirkwood | 3 | 0 |
| Historic New Castle | 2 | 2 |
| Dagsboro | 1 | 1 |
| Dover Afb | 1 | 1 |
| Harbeson | 1 | 1 |
