U.S. Federal Route 31 runs north-south along the western portions of Allegan County. From the Allegan/Van Buren County Line, near South Haven, to Holland this runs on a freeway with Interstate 196 and BUSN Loop I-196. From the south side of Holland to the Allegan/Ottawa County Line, at Holland, it runs on a four-lane highway by-passing the center part of Holland. U.S. Rt. 31 passes through the following town in Allegan County. Holland
U.S. Rt. 31 is multi-plexed in Allegan County. Interstate 196, from the Allegan/Van Buren County Line to Holland.