Morrow County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 34,827. Its county seat is Mount Gilead. The county was organized in 1848 from parts of four neighboring counties and named for Jeremiah Morrow, Governor of Ohio from 1822 to 1826. Shawnee people used the area for hunting purposes before white settlers arrived in the early 19th century.