The village of St John is located within the county of Cornwall.
The Parish Church (a Grade I listed building) is called St John: St John the Baptist and serves the parish of St John and the benefice of St John w Millbrook and belongs to the diocese of Truro.
St John is situated in the South West (England) region of the UK and is governed by Cornwall, council.
The village of St John is in the Cornwall and Isles of Scilly region of Cornwall and Isles of Scilly within South West (England).