With a population of 1,723 (out of a total population of Scilly of 2,203) St Mary's is relatively densely populated; much of its population resides in the western half of the island.
With a population of 1,723 (out of a total population for Scilly of 2,203) St Mary's is relatively densely populated, with twice the average population density for the Isles. The majority of St Mary's residents live in the western half of the island.