Rochester Hills, MI has a population of 72,987 and is the 493rd largest city in the United States. The population density is 2,225 per sq mi which is 2106% higher than the Michigan average and 2356% higher than the national average. The median age in Rochester Hills is 42 which is approximately 6% higher than the Michigan average of 40. In Rochester Hills, 65% of the population over 15 years of age are married, 80% speak English and 3% speak Spanish. 66% of Rochester Hills residents were born in Michigan, 15% were born out of state, 1% were born outside of the United States and 17% were foreign born.