South Monroe, MI has a population of 6,254 and is the 5,600th largest city in the United States. The population density is 2,638 per sq mi which is 2515% higher than the Michigan average and 2812% higher than the national average. The median age in South Monroe is 44 which is approximately 10% higher than the Michigan average of 40. In South Monroe, 56% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 71% of South Monroe residents were born in Michigan, 26% were born out of state, 1% were born outside of the United States and 2% were foreign born.