Postcode areas 18XXX
- Postcode area 18000 Bourges
- Postcode area 18100 Vierzon
- Postcode area 18110 Saint-Martin-d'Auxigny
- Postcode area 18120 Lury-sur-Arnon
- Postcode area 18130 Dun-sur-Auron
- Postcode area 18140 Sancergues
- Postcode area 18150 La Guerche-sur-l'Aubois
- Postcode area 18160 Lignières
- Postcode area 18170 Le Châtelet
- Postcode area 18190 Châteauneuf-sur-Cher
- Postcode area 18200 Saint-Amand-Montrond
- Postcode area 18210 Charenton-du-Cher
- Postcode area 18220 Les Aix-d'Angillon
- Postcode area 18230 Saint-Doulchard
- Postcode area 18240 Léré
- Postcode area 18250 Henrichemont
- Postcode area 18260 Vailly-sur-Sauldre
- Postcode area 18270 Culan
- Postcode area 18290 Chârost
- Postcode area 18300 Sancerre
- Postcode area 18310 Graçay
- Postcode area 18320 Jouet-sur-l'Aubois
- Postcode area 18330 Neuvy-sur-Barangeon
- Postcode area 18340 Levet
- Postcode area 18350 Nérondes
- Postcode area 18360 Saulzais-le-Potier
- Postcode area 18370 Châteaumeillant
- Postcode area 18380 La Chapelle-d'Angillon
- Postcode area 18390 Saint-Germain-du-Puy
- Postcode area 18400 Saint-Florent-sur-Cher
- Postcode area 18410 Argent-sur-Sauldre
- Postcode area 18500 Mehun-sur-Yèvre
- Postcode area 18510 Menetou-Salon
- Postcode area 18520 Avord
- Postcode area 18570 La Chapelle-Saint-Ursin
- Postcode area 18600 Sancoins
- Postcode area 18700 Aubigny-sur-Nère
- Postcode area 18800 Baugy