| Locality | Postal Code |
|---|---|
| Marton | HU11 |
| Meaux | HU17 9SS |
| Melbourne | YO42 |
| Melton | HU14 |
| Meltonby | YO42 |
| Metham | DN14 |
| Middleton on the Wolds | YO25 |
| Millington | YO42 |
| Nafferton | YO25 |
| Neswick | YO25 |
| New Ellerby | HU11 |
| Newland | DN14 |
| Newport | HU15 |
| Newsholme | DN14 |
| Newton on Derwent | YO41 |
| North Cave | HU15 |
| North Cliffe | YO43 |
| North Dalton | YO25 |