U.S. Federal Route 31 is a north-south freeway in Western Oceana County. It runs from the Muskegon/Oceana County Line, near Montague, to the Oceana/Mason County Line, near Pentwater. U.S. Rt. 31 does not pass through any towns in Oceana County. U.S. Rt. 31 is not multi-plexed in Oceana County. U.S. Rt. 31 intersects the following highways in Oceana County. Michigan State Route 20, near New Era. BUSN U.S. Rt. 31, near Hart. BUSN U.S. Rt. 31, near Pentwater. BUSN U.S. Rt. 31, near Pentwater.
Branches of U.S. Rt. 31 in Oceana County. NB U.S. Rt. 31 at the Muskegon/Oceana County Line. NB U.S. Rt. 31 south a Park Road. NB U.S. Rt. 31 south of MI St Rt 20. NB U.S. Rt. 31 at MI St Rt 20. A guide marker on NB Oceana Drive. A guide marker in Shelby. NB U.S. Rt. 31 north of Shelby. NB U.S. Rt. 31 near the Hart Rest Area. NB U.S. Rt. 31 near Mears. SB U.S. Rt. 31 south of BUSN U.S. Rt. 31 near Hart. A BGS on SB BUSN U.S. Rt. 31, near Hart. A guide marker on NB Oceana Dr. near Pentwater. A junction marker on NB BUSN U.S Rt. 31. A guide marker on NB BUSN U.S. Rt. 31.
