Bath, MI has a population of 2,133 and is the 10,640th largest city in the United States. The population density is 372 per sq mi which is 268% higher than the Michigan average and 310% higher than the national average. The median age in Bath is 37 which is approximately 7% lower than the Michigan average of 40. In Bath, 65% of the population over 15 years of age are married, 95% speak English and 4% speak Spanish. 86% of Bath residents were born in Michigan, 9% were born out of state, 2% were born outside of the United States and 3% were foreign born.