Olathe is a statutory town in Montrose County, Colorado, United States. The population was 2,019 as of the 2020 census, up from 1,849 at the 2010 census. Olathe was originally named Brown. The Brown, Colorado, post office opened on April 2, 1883, but was renamed Olathe on June 4, 1896. The community was named after Olathe, Kansas.
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