| Name | Country | 14C dates | |
|---|---|---|---|
|
381-400 / 735 show all | |||
| Médio Tejo | Portugal | 0 | Show |
| Merseyside | England | 0 | Show |
| Middelfart | Denmark | 7 | Show |
| Middelfart Municipality | Denmark | 2 | Show |
| Midi-Pyrénées | France | 0 | Show |
| Midlothian | Scotland | 0 | Show |
| Midtjylland | Denmark | 25 | Show |
| Milton Keynes | England | 0 | Show |
| Mittelböhmische Region / Středočeský kraj | Czech Republic | 0 | Show |
| Molise | Italy | 0 | Show |
| Monaghan | Ireland | 17 | Show |
| Monmouthshire | United Kingdom | 5 | Show |
| Moravian-Silesian Region | Czech Republic | 1 | Show |
| Moravskoslezský | Czech Republic | 0 | Show |
| Moray | United Kingdom | 8 | Show |
| Moyle | Northern Ireland | 0 | Show |
| Moyle | Ireland | 0 | Show |
| Munster | Ireland | 5 | Show |
| Murcia | Spain | 0 | Show |
| Muscat Governorate | Oman | 0 | Show |
