St Blazey is situated in the Deanery and Hundred of Powder. It is bounded on the South and South-West by St Austell, on the North by Luxulyan, and on the East it is separated from Tywardreath by the River Par. The village lies on the main road to the East of St Austell. It is closely linked to St Blazey Gate, which is that part of the parish on the Western side towards St Austell. The parish of Biscovey (Par) was formed out of St Blazey in 1847.