Onekama, MI has a population of 458 and is the 20,091st largest city in the United States. The population density is 780 per sq mi which is 674% higher than the Michigan average and 761% higher than the national average. The median age in Onekama is 46 which is approximately 15% higher than the Michigan average of 40. In Onekama, 60% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 81% of Onekama residents were born in Michigan, 19% were born out of state, 0% were born outside of the United States and 0% were foreign born.