The 1867 White's Covered Bridge, Flat River
Ionia County is a county in the U.S. state of Michigan. It is part of the Grand Rapids-Wyoming Metropolitan Statistical Area.
As of the 2010 census, the population was 63,905. The county seat is Ionia. The Ionia County Courthouse was built by Claire Allen, a prominent southern Michigan architect.
According to the 2000 census, the county has a total area of 580.23 square miles, of which 573.21 square miles (or 98.79%) is land and 7.02 square miles (or 1.21%) is water.There are, according to the 2010 U.S. Census, 20,606 households out of which 38.10% had children under the age of 18 living with them. The average household size is 2.70 and the average family size was 3.15.
Ionia County was formed in 1831 from portions of Mackinac County and open territory. It was named after Ionia, the ancient Greek region in Asia Minor nowaday Turkey.