The city developed northeast of Dayton on land between the Great Miami River and the Mad River. State Routes 202 (Old Troy Pike) and 201 (Brandt Pike) serve as the main north–south arteries, while Shull Rd., Executive Blvd., Interstate 70, Taylorsville, Chambersburg, and Fishburg Roads serve as the main east–west arteries. The bulk of the city lies between Needmore Road to the south and Interstate 70 to the North. Recent development has expanded the boundaries of the city north into Miami County near National Road.