Mission is a city in Johnson County, Kansas, United States. The population was 9,727 at the 2000 census. The city is a first-tier suburb in the Kansas City Metro. In 2003, Mission absorbed the neighboring city of Countryside.
The site where Mission now sits was once a rest stop for wagons moving westward on the Santa Fe Trail during the 19th Century. The clear spring water rising to the surface in present-day Mission made it an ideal place to collect drinking water for horses and travelers. For years the area was owned as a homestead by the Breyfogel family, who subdivided their land into 245 lots and sold them off in the early 20th Century. The town grew up slowly in the 1920s and 1930s, benefiting from its close proximity to Kansas City, Missouri. After World War II however, the town grew rapidly amid the post-war housing boom, as young families from Kansas City purchased their first homes. Today, the town retains this "post-war look," with small houses of different designs on large lots, in contrast to stereotypical neighborhoods of outer-ring suburbs.
Mission is located at 39°1′32″N 94°39′22″W / 39.02556°N 94.65611°W / 39.02556; -94.65611 (39.025572, -94.656056). According to the United States Census Bureau, the city has a total area of 2.5 square miles (6.6 km²), all of it land.