GREENVILLE, a borough of Mercer county, Pa., U.S.A., 8om. N. of Pittsburgh, on the Shenango river. It is served by the Bessemer and Lake Erie, the Erie and the Pennsylvania rail ways. The population was 8,1oi in 192o; 193o was 8,628. It has railroad repair shops, and its manufactures include steel cars, bridges and tanks. Thiel college (Lutheran; co-educational), opened in 1866 at Monaca, in Beaver county, was moved to Greenville in 187o. Greenville was founded in 1798.