East Grinstead is a town and civil parish in the northeastern corner of Mid Sussex District of West Sussex in England near the East Sussex, Surrey, and Kent borders. It lies 27 miles (43 km) south of London, 21 miles (34 km) north northeast of Brighton, and 38 miles (61 km) east northeast of the county town of Chichester. The civil parish covers an area of 2,443.45 hectares (6,037.9 acres) and had a population of 23,942 persons in the 2001 census. The population of the town at the 2011 Census was 26,383.
Nearby towns append Crawley and Horley to the west, Tunbridge Wells to the east and Redhill and Reigate to the northwest. The town is contiguous later than the village of Felbridge to the northwest. Until 1974 East Grinstead was the centre for local government – East Grinstead Urban District Council – and was located in the county of East Sussex. East Grinstead, along later Haywards Heath and Burgess Hill, as share of the former Cuckfield Rural District Council, came together as Mid-Sussex; moving to the jurisdiction of West Sussex County Council. The town has many historic buildings and is located on the Greenwich Meridian. It is located in the Weald and Ashdown Forest lies to the south-east of the town.