Olathe (/oʊˈleɪθə/ oh-LAY-thə) is a city in, and is the county seat of, Johnson County, Kansas, United States. It is the fourth most populous city in Kansas, with a 2010 population of 125,872. By 2017, the Census Bureau estimated Olathe's population had grown to 137,472. Olathe is also the fourth-largest city in the Kansas City metropolitan area. It is bordered by the cities of Lenexa to the north, Overland Park to the east, De Soto to the northwest, and Gardner to the southwest.
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