Ottoville is a village in Monterey Township, Putnam County, Ohio, United States. The population was 966 at the 2020 census. The first plat at Ottoville was made in 1845 for John Otto Bredeich. The effort at first proved unsuccessful, and the town site was platted again in 1873. A post office called Otto was established in 1880, and the name was change…Ottoville is a village in Monterey Township, Putnam County, Ohio, United States. The population was 966 at the 2020 census. The first plat at Ottoville was made in 1845 for John Otto Bredeich. The effort at first proved unsuccessful, and the town site was platted again in 1873. A post office called Otto was established in 1880, and the name was changed to Ottoville in 1881. Ottoville was incorporated as a village in 1890.
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