Amasa, MI has a population of 289 and is the 22,687th largest city in the United States. The population density is 72 per sq mi which is 29% lower than the Michigan average and 21% lower than the national average. The median age in Amasa is 46 which is approximately 15% higher than the Michigan average of 40. In Amasa, 64% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 73% of Amasa residents were born in Michigan, 27% were born out of state, 0% were born outside of the United States and 0% were foreign born.