ST HYACINTH, a town of East Canada, in the county of the same name, on the River Yamaska, 30 miles E. by N. of Montreal, and 137 S.W. of Montreal. The Roman Catholic college, founded in 1812, occupies a fine stone building surmounted by a dome, and has beautiful grounds. The number of professors and directors is 23, that of students 343; and there is an excellent library of 7000 volumes. There are also in the town an episcopal palace, court-house, city-hall, and market. Public education and the relief of the destitute sick are provided for by schools and hospitals. Numerous manufactures are carried on, and the place is one of the most thriving commercial towns of Canada. Pop. about 5000.