The county borders Wyandotte, Miami, Franklin, Douglas and Leavenworth Counties in Kansas; as well as Jackson and Cass Counties in Missouri.
Main highways through the county include I-35, I-435, US-50, US-56, US-59, US-169, K-7 and K-10.
Cities
De Soto
Edgerton
Lexana
Olathe
Shawnee
Stanley