Lyndon is a city located in Osage County Kansas. It is also the county seat of Osage County. With a 2020 population of 1,025, it is the 187th largest city in Kansas and the 10198th largest city in the United States . Lyndon is currently growing at a rate of 0.20% annually but its population has decreased by -2.57% since the most recent census, which recorded a population of 1,052 in 2010. Lyndon reached it's highest population of 1,054 in 2010. Spanning over 1 miles, Lyndon has a population density of 1,149 people per square mile.
The average household income in Lyndon is $64,112 with a poverty rate of 7.96%. The median rental costs in recent years comes to $725 per month, and the median house value is $94,600. The median age in Lyndon is 35.9 years, 31.6 years for males, and 37 years for females.