Onaga is a city located in Pottawatomie County Kansas. With a 2020 population of 672, it is the 245th largest city in Kansas and the 12054th largest city in the United States . Onaga is currently declining at a rate of -0.74% annually and its population has decreased by -4.27% since the most recent census, which recorded a population of 702 in 2010. Onaga reached it's highest population of 705 in 2012. Spanning over 1 miles, Onaga has a population density of 1,025 people per square mile.
The average household income in Onaga is $63,793 with a poverty rate of 12.18%. The median rental costs in recent years comes to $595 per month, and the median house value is $65,400. The median age in Onaga is 57.6 years, 50.2 years for males, and 65.3 years for females.