There was originally a church burial ground but this was very small. A new cemetery at the northern extremity of the borough was consecrated on 15th July 1780, to which an addition was made in 1805. The Cornwall Family History Society have published Monumental Inscriptions for St Mary's Parish Church - 2986 entries. St Mary's cemetery no longer exists, and a municipal burial ground was opened in the 19th century (see Truro City).
You can see maps centred on OS grid reference SW825449 (Lat/Lon: 50.263862, -5.053210), St Mary's which are provided by: