Marengo is located in Morrow county Ohio with a geographic area of 0.2 square miles. The total population in Marengo is 269 with 51.3% male and 48.7% female. Children under age 5 represent 5.2% of the population, under age 18 equal 18.6% of the population and over age 65 is 13.4% of the population. The median household income is $36,250, per capita income is $22,662. There are a total of 118 housing units with 50.0% owner occupied. Education includes 50.8% of residents that are high school graduates and 11.9% with a bachelor's degree or higher. The average temperature in Marengo in the summer is 73 degrees, and in the winter 32 degrees.