The RM postcode area, also known as the Romford postcode area, is a group of twenty postcode districts in south-east England, within nine post towns. These cover parts of eastern Greater London and south-west Essex. Inward mail for the area is sorted, along with mail for the E and IG postcode areas, at the Romford Mail Centre. In Greater London, the area covers most of the London Borough of Havering (including Romford, Hornchurch, Rainham and Upminster), the eastern part of the London Borough of Barking and Dagenham (including Dagenham itself) and a small part of the London Borough of Redbridge. In Essex, the area covers most of the Thurrock unitary district (including Grays, Purfleet, South Ockendon and Tilbury), while RM4 covers small parts of the Epping Forest District and the Borough of Brentwood. Coverage The approximate coverage of the postcode districts: ! RM1 | ROMFORD | Romford, Rise Park | Havering |- ! RM2 | ROMFORD | Gidea Park, Heath Park | Havering |- ! RM3 | ROMFORD | Harold Wood, Harold Hill, Noak Hill, Harold Park | Havering |- ! RM4 | ROMFORD | Havering-atte-Bower, Abridge, Stapleford Abbotts, Noak Hill, Navestock, Stapleford Tawney, Stapleford Aerodrome, Passingford Bridge | Havering, Epping Forest, Brentwood |- ! RM5 | ROMFORD | Collier Row | Havering, Redbridge |- ! RM6 | ROMFORD | Chadwell Heath, Marks Gate, Little Heath, Goodmayes (north), Hainault (South) | Barking and Dagenham, Redbridge, Havering |- ! RM7 | ROMFORD | Rush Green, Mawneys, Romford | Havering |- ! RM8 | DAGENHAM | Dagenham, Becontree, Becontree Heath, Chadwell Heath (south) | Barking and Dagenham, Redbridge |- ! RM9 | DAGENHAM | Dagenham, Becontree Castle Green, Beam Park (west) | Barking and Dagenham, Redbridge, Havering |- ! RM10 | DAGENHAM | Dagenham, Becontree | Barking and Dagenham |- ! RM11 | HORNCHURCH | Hornchurch, Emerson Park, Ardleigh Green | Havering |- ! RM12 | HORNCHURCH | Hornchurch, Elm Park | Havering |- ! RM13 | RAINHAM | Rainham, South Hornchurch, Wennington, Hornchurch Marshes, Beam Park (east) | Havering |- ! RM14 | UPMINSTER | Upminster, Cranham, North Ockendon, Bulphan | Havering, Thurrock |- ! RM15 | | South Ockendon, Aveley | Thurrock, Havering |- ! RM16 | GRAYS | Chafford Hundred, Chadwell St Mary, North Stifford, Orsett | Thurrock |- ! RM17 | GRAYS | Grays, Badgers Dene | Thurrock |- ! RM18 | TILBURY | Tilbury, East Tilbury, West