Cincinnati is a city in Appanoose County, Iowa, United States. The population was 290 in the 2020 census, a decline from 428 in 2000. …Cincinnati is a city in Appanoose County, Iowa, United States. The population was 290 in the 2020 census, a decline from 428 in 2000. Cincinnati's longitude and latitude coordinatesin decimal form are 40.630309, −92.923734.
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