| Borings | Index | Borings |
 |
|
 |
Township Index
| DUR | Mainsforth |
| DUR | Marwood |
| NBL | Mason |
| DUR | Medomsley |
| NBL | Melkridge |
| NBL | Mickley |
| DUR | Middleston Common |
| DUR | Middlestone |
| DUR | Middleton-in-Teesdale |
| DUR | Middridge |
| DUR | Middridge Grange |
| DUR | Monk Hesleden |
| NBL | Monkridge |
| NBL | Monkseaton |
| DUR | Monkwearmouth |
| DUR | Moor House |
| DUR | Moorsley |
| DUR | Mordon |
| NBL | Morpeth |
| NBL | Morpeth Castle |
| NBL | Morpeth Castle, Catchburn, Stobhill and Park House |
| NBL | Morwick |
| DUR | Muggleswick |
| DUR | Murton |
| NBL | Murton |
