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Olathe is the county seat of Johnson County and, with 141,290 residents in the 2020 census, the fourth-most populous city in Kansas and in the Kansas City metropolitan area.

Olathe was founded in the spring of 1857 by Dr. John T. Barton, who staked two quarter-sections at the center of Johnson County, and it was incorporated in 1857 and again in 1868.

Olathe became the Johnson County seat in October 1859, and Census Bureau QuickFacts counts about 53,000 households in the city, averaging 2.70 people each.

Olathe was a stop on the Oregon, California and Santa Fe Trails, and the city preserves the Mahaffie Stagecoach Stop & Farm — the last remaining stagecoach stop on the Santa Fe Trail — with period-costumed staff and stagecoach rides.

The Kansas State School for the Deaf was founded in 1861 and moved to Olathe in 1866, where it still operates.

MidAmerica Nazarene University, a private Christian university in Olathe, was founded in 1966.

Garmin International, the GPS and wearables technology company, is headquartered in Olathe and is among the city's largest employers, alongside Honeywell, Farmers Insurance and others.

The Federal Aviation Administration's Kansas City Center (ZKC), one of the nation's air traffic control centers, is located in Olathe.

Johnson County Executive Airport, covering about 500 acres, serves general aviation in Olathe.

Britannica describes Olathe as the fastest-growing city in Kansas in the late 20th and early 21st centuries, transformed from a small prairie town into a major Kansas City suburb.