| Name | Country | 14C dates | |
|---|---|---|---|
|
401-420 / 936 show all | |||
| Moravskoslezský | Czechia | 1 | Show |
| Moravske Toplice | Slovenia | 1 | Show |
| Monmouthshire | United Kingdom | 18 | Show |
| Monaghan | Ireland | 17 | Show |
| Mogila | North Macedonia | 3 | Show |
| Modena | Italy | 21 | Show |
| Milton Keynes | United Kingdom | 26 | Show |
| Milano | Italy | 1 | Show |
| Miklavž na Dravskem polju | Slovenia | 3 | Show |
| Mid Ulster | United Kingdom | 44 | Show |
| Midtjylland | Denmark | 568 | Show |
| Midlothian | United Kingdom | 2 | Show |
| Meuse | France | 10 | Show |
| Meurthe-et-Moselle | France | 3 | Show |
| Metlika | Slovenia | 3 | Show |
| Messina | Italy | 26 | Show |
| Merton | United Kingdom | 2 | Show |
| Mersin | Turkey | 18 | Show |
| Mehedinti | Romania | 5 | Show |
| Medway | United Kingdom | 1 | Show |
