The Federal Census of 1860 contains schedules for Vienna Township, Trumbull County, Ohio. The population of the Township in 1860 was 941. The population of Ohio was 2,339,511. The total population of the United States in 1860 was 31,443,321. Of this number 3,953,761 were enslaved.
The United States Constitution requires that a population census be undertaken every ten years to determine the appropriation of seats in the United States House of Representatives and for the collection of taxes. The United States was the first nation to legislate a regularly held census. This seventh census taken in the United States recorded the population as of June 1, 1860.