Ionia is a village in northern Benton and southern Pettis counties in the U.S. state of Missouri. The population was 88 at the 2010 census. Ionia was originally called Ionia City, and under the latter name was platted in 1866. A post office called Ionia City was established in 1867, and the name was changed to Ionia in 1895. The community most likely was …Ionia is a village in northern Benton and southern Pettis counties in the U.S. state of Missouri. The population was 88 at the 2010 census. Ionia was originally called Ionia City, and under the latter name was platted in 1866. A post office called Ionia City was established in 1867, and the name was changed to Ionia in 1895. The community most likely was named after the Ionic order in Freemasonry.
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