Lyndon is a city in and the county seat of Osage County, Kansas, United States. As of the 2020 census, the population of the city was 1,037. L…Lyndon is a city in and the county seat of Osage County, Kansas, United States. As of the 2020 census, the population of the city was 1,037. Lyndon was founded in 1869 after the land in the area was taken from the Sac and Fox Nation by the government for homesteading. It was named after Lyndon, Vermont.
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