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is a city in Osage County, Kansas, United States. It is part of the Topeka, Kansas Metropolitan Statistical Area. The population was 1,038 at the 2000 census. It is the county seat of Osage County.
Lyndon is located at (38.610233, -95.685352).
According to the United States Census Bureau, the city has a total area of 0.8 square miles (1.9 km²), all of it land.