JACKSONVILLE, a town of the United States of North America, capital of Morgan county, in the state of Illinois, situate 32 miles W. of Springfield, on the Sangamon and Morgan Railway, in an undulating and fertile plain near Movestar creek, a tributary of Illinois River. It is well built, and contains some elegant public buildings, the principal of which are the college, the asylums for the blind, deaf, and dumb, and the insane. The manufactures of the town include flour, cotton, leather, and machinery. Pop. (1850) 2745.