| Lomme Cedex (59466) | - | - |
| Lomme Cedex (59467) | - | - |
| Lomme Cedex (59468) | - | - |
| Lomme Cedex (59469) | - | - |
| Lompret (59840) | - | - |
| Looberghe (59630) | - | - |
| Loon Plage (59279) | - | - |
| Loos (59120) | - | - |
| Loos Cedex (59371) | - | - |
| Loos Cedex (59372) | - | - |
| Loos Cedex (59373) | - | - |
| Loos Cedex (59374) | - | - |
| Lourches (59156) | - | - |
| Louvignies Bavay (59570) | - | - |
| Louvignies Quesnoy (59530) | - | - |
| Louvil (59830) | - | - |
| Louvroil (59720) | - | - |
| Lynde (59173) | - | - |
| Lys Lez Lannoy (59390) | - | - |
| Lys Lez Lannoy Cedex (59451) | - | - |
| Lys Lez Lannoy Cedex (59452) | - | - |
| Lys Lez Lannoy Cedex (59453) | - | - |
| Lys Lez Lannoy Cedex (59454) | - | - |
| Lys Lez Lannoy Cedex (59455) | - | - |
| Lys Lez Lannoy Cedex (59456) | - | - |
| Lys Lez Lannoy Cedex (59457) | - | - |
| Lys Lez Lannoy Cedex (59458) | - | - |
| Lys Lez Lannoy Cedex (59459) | - | - |
| Maing (59233) | - | - |
| Mairieux (59600) | - | - |
| Malincourt (59127) | - | - |
| Malo Les Bains (59240) | - | - |
| Marbaix (59440) | - | - |
| Marchiennes (59870) | - | - |
| Marcoing (59159) | - | - |
| Marcq En Baroeul (59700) | - | - |
| Marcq En Baroeul Cedex (59701) | - | - |
| Marcq En Baroeul Cedex (59702) | - | - |
| Marcq En Baroeul Cedex (59703) | - | - |
| Marcq En Baroeul Cedex (59704) | - | - |
| Marcq En Baroeul Cedex (59705) | - | - |
| Marcq En Baroeul Cedex (59706) | - | - |
| Marcq En Baroeul Cedex (59707) | - | - |
| Marcq En Baroeul Cedex (59708) | - | - |
| Marcq En Baroeul Cedex (59709) | - | - |
| Marcq En Ostrevent (59252) | - | - |
| Mardyck (59279) | - | - |
| Maresches (59990) | - | - |
| Maretz (59238) | - | - |
| Marly (59770) | - | - |
| Maroilles (59550) | - | - |
| Marpent (59164) | - | - |
| Marquette En Ostrevant (59252) | - | - |
| Marquette En Ostrevent (59252) | - | - |
| Marquette Lez Lille (59520) | - | - |
| Marquillies (59274) | - | - |
| Masnieres (59241) | - | - |
| Masny (59176) | - | - |
| Mastaing (59172) | - | - |
| Maubeuge (59600) | - | - |
| Maubeuge Cedex (59361) | - | - |
| Maubeuge Cedex (59362) | - | - |
| Maubeuge Cedex (59363) | - | - |
| Maubeuge Cedex (59364) | - | - |
| Maubeuge Cedex (59365) | - | - |
| Maubeuge Cedex (59366) | - | - |
| Maubeuge Cedex (59367) | - | - |
| Maubeuge Cedex (59368) | - | - |
| Maubeuge Cedex (59369) | - | - |
| Maubeuge Cedex (59601) | - | - |
| Maubeuge Cedex (59602) | - | - |
| Maubeuge Cedex (59603) | - | - |
| Maubeuge Cedex (59604) | - | - |
| Maubeuge Cedex (59605) | - | - |
| Maubeuge Cedex (59606) | - | - |
| Maubeuge Cedex (59607) | - | - |
| Maubeuge Cedex (59608) | - | - |
| Maubeuge Cedex (59609) | - | - |
| Maulde (59158) | - | - |
| Maurois (59980) | - | - |
| Mazinghien (59360) | - | - |
| Mecquignies (59570) | - | - |
| Merckeghem (59470) | - | - |
| Merignies (59710) | - | - |
| Merris (59270) | - | - |
| Merville (59660) | - | - |
| Meteren (59270) | - | - |
| Millam (59143) | - | - |
| Millonfosse (59178) | - | - |
| Monceau St Waast (59620) | - | - |
| Monchaux Sur Ecaillon (59224) | - | - |
| Moncheaux (59283) | - | - |
| Monchecourt (59234) | - | - |
| Mons Baroeul (59370) | - | - |
| Mons En Baroeul (59370) | - | - |
| Mons En Pevele (59246) | - | - |
| Mons Pevele (59246) | - | - |
| Mont De Premesques (59840) | - | - |
| Mont Des Cats (59270) | - | - |
| Mont Noir (59270) | - | - |