In a special election on December 3, 2002, residents voted to consolidate with the surrounding city of Mission, Kansas, in which the houses and streets had originally been built in the unincorporated Mission Township of Johnson County beginning in 1937.

As a city, Countryside consisted of 133 houses of middle to upper-class value situated with Lamar Avenue on the west, West 61st Street on the north, Nall Avenue on the east and Shawnee Mission Parkway on the south.

The south side of West 62nd Terrace is a parkway strip of well-kept grass and trees opening, on its far side, onto a view of West 63rd Street, which had become a divided four-lane major artery, also running in an east–west direction, through Johnson County in 1960.

In 1983, the W 63rd Street, Rock Creek Pkwy, Johnson Drive (US 56 & 169) corridor was renamed Shawnee Mission Parkway to reduce confusion about the three names and multiple numbers the road carried.

[2] According to the United States Census Bureau, the city had a total area of 0.3 km2 (0.12 sq mi), all land.