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.
Iowa people
By 1980 their population had recovered to 1,000 (of which only 20 spoke Iowa). In 1990 there were 1,700 people. According to the Bureau of Indian Affairs, in 1995 there were 533 individuals living in the Iowa reservations of Kansas and 44 in Nebraska (Horton Agency), while 857 people lived in the Oklahoma Iowa Tribe (Shawnee Agency), amounting to a total of 2,934 people. According to the 2000 census, 1,451 people identified as full-blood Iowa, 76 were of mixed-Indian descent, 688 of mixed-race descent, and 43 of mixed-race and tribe descent, amounting to 2,258 people.