| City Name | County | Zip Code |
| Magnolia | Kent | 19962 |
| Manor | New Castle | 19720 |
| Marshallton | New Castle | 19808 |
| Marydel | Kent | 19964 |
| Middletown | New Castle | 19709 |
| Midway | Sussex | 19971 |
| Milford | Sussex | 19963 |
| Millsboro | Sussex | 19966 |
| Millville | Sussex | ***** |
| Milton | Sussex | 19968 |
| Montchanin | New Castle | 19710 |
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