Overland Park is located in northeastern Kansas at the junction of Interstate 435 and U.S. Route 69 immediately east of Olathe, the county seat. The city center is roughly 13 miles south-southwest of downtown Kansas City, Missouri. According to the United States Census Bureau, the city has a total area of 75.37 square miles of which 74.84 square miles is land and 0.53 square mile is water. Most of Overland Park, specifically the part of it lying north of 159th Street, lies within the area of Johnson County referred to as Shawnee Mission.
As a suburb of Kansas City, Missouri, Overland Park is part of the Kansas City metropolitan area, and it borders other communities on all sides. These include Kansas City, Kansas, to the north, Mission and Prairie Village to the northeast, Leawood to the east, Stilwell to the south, Olathe and Lenexa to the west, and Shawnee and Merriam to the northwest.