739 royal mail

You're referring to the Royal Mail postcode area "RH"!

"RH" is a postcode area in the RH postcode district, which covers the following areas:

• Horsham
• Crawley
• East Grinstead
• Haywards Heath
• Reigate
• Redhill
• Tonbridge
• Tunbridge Wells

The "RH" postcode area is located in the southeastern part of England, in the counties of West Sussex, East Sussex, and Kent.