The parish of Kenwyn is situated in the deanery and Hundred of Powder. It is bounded on the north by St Allen, on the east by St Clements, the parish of St Marys Truro and the river Fal, on the south by Kea, and on the west by St Agnes, the detached part of Kea called Tregavethen, and Perranzabuloe.

This parish stretches north-west from Truro, Kenwyn church being on the outskirts of the city. A considerable part of the City of Truro was in this parish. Although so near to the centre of Truro, it has rural scenery and an attractive wooded valley. At the beginning of the 21st century, Kenwyn is regarded as a suburb of the City of Truro.