Oswego is a city located in Kansas. With a 2020 population of 1,668, it is the 138th largest city in Kansas and the 8323rd largest city in the United States. Oswego is currently declining at a rate of -0.89% annually and its population has decreased by -8.80% since the most recent census, which recorded a population of 1,829 in 2010. Oswego reached it's highest population of 1,830 in 2010. Spanning over 2 miles, Oswego has a population density of 699 people per square mile.
The average household income in Oswego is $54,152 with a poverty rate of 9.35%. The median rental costs in recent years comes to $542 per month, and the median house value is $56,400. The median age in Oswego is 42.7 years, 38.4 years for males, and 45.1 years for females. For every 100 females there are 101.4 males.