Ottawa is a city located in Kansas. With a 2020 population of 12,337, it is the 29th largest city in Kansas and the 2661st largest city in the United States. Ottawa is currently growing at a rate of 0.28% annually but its population has decreased by -2.47% since the most recent census, which recorded a population of 12,649 in 2010. Ottawa reached it's highest population of 12,639 in 2010. Spanning over 10 miles, Ottawa has a population density of 1,250 people per square mile.
The average household income in Ottawa is $58,002 with a poverty rate of 12.92%. The median rental costs in recent years comes to $761 per month, and the median house value is $103,300. The median age in Ottawa is 35.4 years, 34.1 years for males, and 36.6 years for females. For every 100 females there are 88.1 males.