Ottoville is located in Putnam county Ohio with a geographic area of 0.9 square miles. The total population in Ottoville is 919 with 48.5% male and 51.5% female. Children under age 5 represent 5.1% of the population, under age 18 equal 22.7% of the population and over age 65 is 17.8% of the population. The median household income is $63,417, per capita income is $36,961. There are a total of 422 housing units with 75.1% owner occupied. Education includes 38.2% of residents that are high school graduates and 26.8% with a bachelor's degree or higher. The average temperature in Ottoville in the summer is 73 degrees, and in the winter 32 degrees.