Interstate 75 (I-75) is a major and heavily trafficked south-north highway in the area of the Great Lakes and the southeastern parts of the United States that crosses six different states. The stretch of the route in the state of Ohio has a length of 211.55 miles and crosses the counties of Hamilton, Butler, Warren, Montgomery, Miami, Shelby, Auglaize, Allen, Hancock, Wood, and Lucas. The highway begins at the Kentucky state line near Cincinnati, and ends at the Michigan state line near Toledo. It opened in 1957.
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