Michigan State Route 66 is a north-south highway in Central Antrim County. It runs from the Antrim/Kalkaska County Line, near Westwood, to the Antrim/Charlevoix County Line, near East Jordan. MI St Rt 66 passes through the following towns in Antrim County. Antrim Mancelona
Green River MI St Rt 66 is multi-plexed in Antrim County. U.S. Rt. 131, from the Antrim/Kalkaska County Line, to Mancelona.
A guide marker on EB MI St Rt 88. NB U.S. Rt. 131/MI St Rt 66 north of MI St Rt 88. NB U.S Rt. 131/MI St Rt 66 near Valley Road. A junction marker on NB U.S. Rt. 131/MI St Rt 66.