The church town of St Allen is an isolated hamlet and the main settlement in the parish is Zelah which is situated on the A30 trunk road four miles (6.5 km) north of Truro.

[1] The population in the 2001 census was 435 people and the parish occupies 3,506 acres (14.19 km2) of land.

[4] Little is known of this saint but he has been identified with the Breton bishop Alan of Quimper who came from Wales.

The 1881 English Census indicates that John Noon Munford was the Rector and living in the Rectory with his wife and two children and two servants.

[6] Cornish wrestling tournaments, for prizes, were held in St Allen in the 1800s.