Castle Court School is located in 35 acres of grounds in rural countryside and centred on a small hill called Knoll Clump. It is about a mile northwest of the centre of Corfe Mullen, 4 miles north-northwest of Poole, 8 miles northwest of Bournemouth and 9 miles southeast of Blandford Forum. Much of the surrounding country is farmland, but the forest plantations of Henbury and Stoney Down are about a mile to the west and southwest of the school.