Country codes: M

 Macau (administrative region of China)

 Madagascar

 Malawi

 Malaysia

 Maldives

 Mali

 Malta

 Marshall Islands

 Martinique (department of France)

 Mauritania

 Mauritius

 Mayotte (department of France)

 Mexico

 Federated States of Micronesia

 Moldova

 Monaco

 Mongolia

 Montenegro(part of Yugoslavia)

 Montserrat (UK territory)

 Morocco

 Mozambique

 Myanmar

1. Mobile country code
2. Country code
3. List of country calling codes
4. Lists of country codes
5. Country codes: A
6. Country codes: R
7. Country codes: B
8. Country codes: G
9. Country codes: F
10. Country codes: U–Z
11. Country codes: L
12. Country codes: T
13. Country codes: S
14. Country codes: C
15. Country codes: N
16. Country codes: D–E
17. Country codes: J–K
18. Country codes: H–I
19. Country codes: O–Q
20. Code M