Ohio
From just over 45,000 residents in 1800, Ohio's population grew at rates of over 10% per decade (except for the 1940 census) until the 1970 census, which recorded just over 10.65 million Ohioans. Growth then slowed for the next four decades. The United States Census Bureau estimates that the population of Ohio was 11,689,442 on July 1, 2018, a 1.33% increase since the 2010 United States Census. Ohio's population growth lags that of the entire United States, and Caucasians are found in a greater density than the United States average. , Ohio's center of population is located in Morrow County, in the county seat of Mount Gilead. This is approximately south and west of Ohio's population center in 1990.
Marion County, Ohio
According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.1%) is water. It is the fifth-smallest county in Ohio by total area.As of the census of 2000, there were 66,217 people, 24,578 households, and 17,253 families residing in the county. The population density was 164 people per square mile (63/km²). There were 26,298 housing units at an average density of 65 per square mile (25/km²). The racial makeup of the county was 92.10% White, 5.75% Black or African American, 0.19% Native American, 0.52% Asian, 0.01% Pacific Islander, 0.49% from other races, and 0.95% from two or more races. 1.09% of the population were Hispanic or Latino of any race.