WARREN, a borough of north-western Pennsylvania, U.S.A., the county seat of Warren county; on the north bank of the Allegheny river. Pop. (1920) 24,272 (85% native white) ; 1930 Federal census 14,863. Warren lies 1,246 ft. above sea-level, at the southern foot of a high, sheer ridge, in a beautiful and fertile region, rich in oil and gas. Hydro-electric power from Niagara Falls and the Clarion river is available, in addition to natural gas from the local field. The city's output of manufactures in 1927
was valued at $18,084,815. In the suburbs is a State hospital for the insane (1873) with grounds covering 1,288 acres. Warren was laid out in 1795, and was named for Gen. Joseph Warren, the Revolutionary war officer. The borough was incorporated in 1832.