Circleville, city (1990 pop. 11,666), seat of Pickaway co., S central Ohio, on the Scioto River; inc. 1853. Corn, hogs, and poultry are processed in the city. Circleville was laid out in 1810 within the remains of a circular fort allegedly erected by mound builders. Its growth was spurred by the building of the Ohio and Erie Canal.
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