St Allen (Cornish: Eglosallen) is a civil parish in Cornwall, England. 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. The population in the 2001 census was 435 people and the parish occupies 3,506 acres (14.19 km2) of land.
One of the many maps available on A Vision of Britain through Time is one from the Ordnance Survey Series of 1900 illustrating the parish boundaries of Cornwall at the turn of the 20th century. This map blows up to show all the parishes and many of the small villages and hamlets.
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