Lake Fenton, MI has a population of 5,386 and is the 6,143rd largest city in the United States. The population density is 978 per sq mi which is 869% higher than the Michigan average and 979% higher than the national average. The median age in Lake Fenton is 45 which is approximately 15% higher than the Michigan average of 40. In Lake Fenton, 64% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 83% of Lake Fenton residents were born in Michigan, 15% were born out of state, 0% were born outside of the United States and 2% were foreign born.