Cadillac is a city in the U.S. state of Michigan and is the county seat of Wexford County. The zipcode location of Cadillac Michigan is 49601. As of the 2000 census, the city population was 10,000. The city is situated at the junction of US 131, M-55 and M-115. The city is between Haring Township on the north and Clam Lake Township on the south. Cadillac became the county seat after the so-called "Battle of Manton" in which a show of force was involved in enforcing a controversial decision to move the county seat from Manton, Michigan.