Section boundaries: Northern Michigan counties (including Upper Peninsula) north following line drawn across state: S boundary of Manistee County and Wexford County to Osceola County; W boundary of Osceola County; S boundary of Osceola County; W boundary of Isabella County; S boundary of Isabella County to Gratiot County; W boundaries of Gratiot and Clinton Counties; S boundaries of Clinton, Shiawassee and Genesee Counties; E boundary of Genesee County to Tuscola County; S boundaries of Tuscola and Sanilac Counties to Lake Huron.