Saint Ignace, usually written as St. Ignace, is a city at the southern tip of the Upper Peninsula of the U.S. state of Michigan, bordering the Straits of Mackinac. The population was 2,452 at the 2010 census. It is the county seat of Mackinac County. For travelers coming from the Lower Peninsula, St. Ignace is the gateway to the northern part of the state.
St. Ignace Township is located just to the north of the city, but is politically independent.
Located in Michigan's Upper Peninsula, St. Ignace is at the northern end of the Mackinac Bridge and Mackinaw City is the southern end. The bridge connects the Lower and the Upper peninsulas of Michigan.