This is a list of postcodes in the NP25 4 area covering the areas of Monmouth, Redbrook, Welsh Newton, Monmouthshire. The area contains approximately 1,539 households with a population of about 3,893 (2011 census)
 Active postcode
Active postcode 
   Postcode no longer in use
Postcode no longer in use| Postcode | Latitude | Longitude | Easting | Northing | Grid reference | Active? | 
|---|---|---|---|---|---|---|
| NP25 4YB | 51.813638 | -2.713798 | 350890 | 213020 | SO508130 | No | 
| NP25 4YD | 51.81297 | -2.715586 | 350766 | 212947 | SO507129 | No | 
| NP25 4YE | 51.81297 | -2.715586 | 350766 | 212947 | SO507129 | No | 
| NP25 4YF | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4YG | 51.78509 | -2.784282 | 345997 | 209894 | SO459098 | No | 
| NP25 4YH | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4YP | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4YQ | 51.81297 | -2.715586 | 350766 | 212947 | SO507129 | No | 
| NP25 4YS | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4YT | 51.81297 | -2.715586 | 350766 | 212947 | SO507129 | No | 
| NP25 4YU | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4YY | 51.78509 | -2.784282 | 345997 | 209894 | SO459098 | No | 
| NP25 4YZ | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4ZB | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4ZL | 51.813105 | -2.715617 | 350764 | 212962 | SO507129 | No | 
| NP25 4ZW | 51.813638 | -2.713798 | 350890 | 213020 | SO508130 | No |