Marine City, MI has a population of 4,161 and is the 7,267th largest city in the United States. The population density is 1,928 per sq mi which is 983% higher than the Michigan average and 2028% higher than the national average. The median age in Marine City is 43 which is approximately 9% higher than the Michigan average of 40. In Marine City, 53% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 85% of Marine City residents were born in Michigan, 14% were born out of state, 0% were born outside of the United States and 1% were foreign born.