Onaga, KS is a city located in Pottawatomie County, Kansas and has a land area of 177.63 square miles (460.06 km2). The water area for the city is 0.47 square miles or 1.22 km2. There is one unique zip code in Onaga, Kansas and it is 66521. The area code(s) for Onaga is 785.
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