Onaga is a city in Pottawatomie County, Kansas, United States. As of the 2020 census, the population of the city was 679. Onaga was platted i…Onaga is a city in Pottawatomie County, Kansas, United States. As of the 2020 census, the population of the city was 679. Onaga was platted in 1877 by the railroad. Onaga is derived from a Potawatomi personal Indian name and was given by Paul E. Havens, President of the Kansas Central Railroad.
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