WARREN, a city of Ohio, U.S.A., on the Mahoning river. Pop. (1920) 27,050 (8o% native white) ; in 1930 by Federal census it was 41,062. The city occupies 8.6 square miles and was named after Moses Warren, a surveyor of the Connecticut Land Company. It was settled in 1799. In 1834 the village was in
corporated, and in 1839 it became a port on the new canal from the Ohio river to Lake Erie. In 1869 it was incorporated as a city. Its output of manufactures in 1927 amounted to $32,227,948.