This is a list of postcodes in the CM20 area covering the areas of Harlow. The area contains approximately 9,218 households with a population of about 21,241 (2011 census)
Active postcode 
  
Postcode no longer in use| Postcode | Latitude | Longitude | Easting | Northing | Grid reference | Active? | 
|---|---|---|---|---|---|---|
| CM20 9UE | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9UF | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UG | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UH | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UJ | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UL | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UN | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9UP | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9UQ | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9UR | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9US | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9UU | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UW | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9UX | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WA | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WB | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WD | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WE | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WF | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WG | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WH | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WJ | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WL | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WN | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WP | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WQ | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WR | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WS | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WT | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WU | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WW | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9WX | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9WY | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9XA | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9XB | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | No | 
| CM20 9XD | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9XE | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9XF | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9XG | 51.771744 | 0.093959 | 544575 | 210193 | TL445101 | Yes | 
| CM20 9ZZ | 51.767657 | 0.094161 | 544602 | 209739 | TL446097 | Yes |