CHARLESTOWN, a sea-port in the parish of ST-AUSTELL, eastern division of the hundred of POWDER, county of CORNWALL, 1 mile (E. S. E.) from St. Austell, with which the population is returned. There is a place of worship for Wesleyan Methodists. This place is situated on the western side of St. Austell bay, and in 1790, when known by the name of Porthmear, contained only nine inhabitants; but since that period, owing to the spirited exertions of Charles Rashleigh, Esq., to whom it owes its modern name, it has become a thriving port, and is still increasing in extent and importance. The harbour is secured by a commodious pier, and defended by a battery of heavy ordnance on Crinnis Cliff; it contains an outer and an inner basin, the latter being capacious enough to admit vessels of five hundred tons' burden. Here are yards and dry docks for building and repairing large ships, and a rope and twine manufactory: a great quantity of lime is burnt; but the chief trade of the place consists in its extensive pilchard fishery, for which several scans have been put on, and receiving - houses erected. Most of the china clay brought from St. Stephen's is shipped at this port.