Mission is a city in Johnson County, Kansas, United States, and part of the Kansas City Metropolitan Area. As of the 2020 census, the populatio…Mission is a city in Johnson County, Kansas, United States, and part of the Kansas City Metropolitan Area. As of the 2020 census, the population of the city was 9,954. An Indian mission was established in 1829 at the town's site, hence the name of the later settlement.
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