Postcode areas 90XXX
- Postcode area 90000 Belfort
- Postcode area 90100 Delle
- Postcode area 90110 Rougemont-le-Château
- Postcode area 90120 Morvillars
- Postcode area 90130 Montreux-Château
- Postcode area 90140 Bourogne
- Postcode area 90150 Fontaine
- Postcode area 90160 Bessoncourt
- Postcode area 90170 Étueffont
- Postcode area 90200 Giromagny
- Postcode area 90300 Valdoie
- Postcode area 90330 Chaux
- Postcode area 90340 Chèvremont
- Postcode area 90350 Évette-Salbert
- Postcode area 90360 Lachapelle-sous-Rougemont
- Postcode area 90370 Réchésy
- Postcode area 90380 Roppe
- Postcode area 90400 Danjoutin
- Postcode area 90500 Beaucourt
- Postcode area 90600 Grandvillars
- Postcode area 90700 Châtenois-les-Forges
- Postcode area 90800 Bavilliers
- Postcode area 90850 Essert