Detroit, MI has a population of 683,443 and is the 18th largest city in the United States. The population density is 4,927 per sq mi which is 4785% higher than the Michigan average and 5338% higher than the national average. The median age in Detroit is 35 which is approximately 12% lower than the Michigan average of 40. In Detroit, 32% of the population over 15 years of age are married, 89% speak English and 7% speak Spanish. 75% of Detroit residents were born in Michigan, 19% were born out of state, 1% were born outside of the United States and 5% were foreign born.