The entire length of the Ohio Turnpike is , from the western terminus in Northwest Township near Edon, where it meets the Indiana Toll Road at the Ohio–Indiana border, to the eastern terminus in Springfield Township near Petersburg where it meets the Pennsylvania Turnpike at the Ohio–Pennsylvania border. Most of the turnpike, between the Indiana border and an interchange with Interstate 76 (I-76) near Youngstown, is signed as part of I-80, while the eastern , between the I-80/I-76 interchange and the Pennsylvania border, is signed as part of I-76. For , between the Indiana border and Elyria, I-90 is cosigned with I-80 as part of the turnpike.