Postcode areas 51XXX
- Postcode area 51000 Châlons-en-Champagne
- Postcode area 51100 Reims
- Postcode area 51110 Bazancourt
- Postcode area 51120 Sézanne
- Postcode area 51130 Vertus
- Postcode area 51140 Jonchery-sur-Vesle
- Postcode area 51150 Tours-sur-Marne
- Postcode area 51160 Ay
- Postcode area 51170 Fismes
- Postcode area 51190 Avize
- Postcode area 51200 Épernay
- Postcode area 51210 Montmirail
- Postcode area 51220 Hermonville
- Postcode area 51230 Fère-Champenoise
- Postcode area 51240 La Chaussée-sur-Marne
- Postcode area 51250 Sermaize-les-Bains
- Postcode area 51260 Anglure
- Postcode area 51270 Montmort-Lucy
- Postcode area 51290 Saint-Remy-en-Bouzemont Saint-Genest
- Postcode area 51300 Vitry-le-François
- Postcode area 51310 Esternay
- Postcode area 51320 Sommesous
- Postcode area 51330 Givry-en-Argonne
- Postcode area 51340 Pargny-sur-Saulx
- Postcode area 51350 Cormontreuil
- Postcode area 51360 Verzenay
- Postcode area 51370 Saint-Brice-Courcelles
- Postcode area 51380 Verzy
- Postcode area 51390 Gueux
- Postcode area 51400 Mourmelon-le-Grand
- Postcode area 51420 Witry-lès-Reims
- Postcode area 51430 Tinqueux
- Postcode area 51450 Bétheny
- Postcode area 51460 Courtisols
- Postcode area 51470 Saint-Memmie
- Postcode area 51480 Damery
- Postcode area 51490 Pontfaverger-Moronvilliers
- Postcode area 51500 Rilly-la-Montagne
- Postcode area 51510 Fagnières
- Postcode area 51520 Sarry
- Postcode area 51530 Magenta
- Postcode area 51600 Suippes
- Postcode area 51700 Dormans
- Postcode area 51800 Sainte-Menehould