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.
Cincinnati metropolitan area
The Cincinnati metropolitan area, informally known as Greater Cincinnati or the Greater Cincinnati Tri-State Area, is a metropolitan area that includes counties in the U.S. states of Ohio, Kentucky, and Indiana around the Ohio city of Cincinnati. The United States Census Bureau's formal name for the area is the Cincinnati–Middletown, OH–KY–IN Metropolitan Statistical Area. As of the 2010 U.S. Census, this MSA had a population of 2,114,580, making Greater Cincinnati the 29th most populous metropolitan area in the United States, the third largest metro area entirely in Ohio, behind Columbus (1st) and Cleveland (2nd), and the largest metro area (including portions of Kentucky and Indiana) in Ohio.