High Quality Content by WIKIPEDIA articles! Interstate 275 (I-275) is an 83.71-mile (134.72 km) loop in Ohio, Indiana, and Kentucky that forms a complete beltway around the Cincinnati, Ohio area. It is the only auxiliary interstate that enters three states, including one state that the parent route does not enter (Indiana). It is the longest loop interstate highway in the United States. For a short distance in northwest Hamilton County it overlaps with I-74 and US 52.