| Name | Country | 14C dates | |
|---|---|---|---|
|
421-440 / 936 show all | |||
| Mecklenburg-Vorpommern | Germany | 196 | Show |
| Meath | Ireland | 217 | Show |
| Maysan | Iraq | 32 | Show |
| Mayo | Ireland | 69 | Show |
| Mayenne | France | 5 | Show |
| Matruh | Egypt | 4 | Show |
| Masovian | Poland | 53 | Show |
| Mary | Turkmenistan | 0 | Show |
| Marne | France | 26 | Show |
| Marijampoles | Lithuania | 1 | Show |
| Maribor | Slovenia | 2 | Show |
| Maramures | Romania | 2 | Show |
| Mantova | Italy | 7 | Show |
| Manche | France | 30 | Show |
| Malatya | Turkey | 57 | Show |
| Málaga | Spain | 56 | Show |
| Maine-et-Loire | France | 13 | Show |
| Magherafelt | United Kingdom | 12 | Show |
| Mafraq | Jordan | 8 | Show |
| Madrid | Spain | 107 | Show |
