St. Ignace, MI has a population of 2,563 and is the 9,696th largest city in the United States. The population density is 972 per sq mi which is 446% higher than the Michigan average and 973% higher than the national average. The median age in St. Ignace is 45 which is approximately 13% higher than the Michigan average of 40. In St. Ignace, 52% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 87% of St. Ignace residents were born in Michigan, 10% were born out of state, 0% were born outside of the United States and 3% were foreign born.