U.S. Federal Route 73 has it's southern end point in Wyandotte County. This highway starts and ends at the interchange with Interstate 435/U.S. Rt. 24, 40 in Kansas City. Then it heads north toward Leavenworth County and the State of Nebraska. U.S. Rt. 73 passes thorugh the following town in Wyandotte County. Kansas City U.S. Rt. 73 is multi-plexed in Wyandotte County. U.S. Rt. 24, at Kansas City. U.S. Rt. 40, at Kansas City. Kansas State Route 7, from Kansas City to the Leavenworth/Wyandotte County Line. U.S. Rt. 73 intersects the following highways in Wyandotte County. Interstate 435, at Kansas City. U.S. Rt. 24, at Kansas City. U.S. Rt. 40, at Kansas City. U.S. Rt. 24, at Kansas City. U.S. Rt. 40, at Kansas City. Kansas State Route 7, at Kansas City.