Madison, OH has a population of 3,166 and is the 8,538th largest city in the United States. The population density is 622 per sq mi which is 142% higher than the Ohio average and 587% higher than the national average. The median age in Madison is 40 which is approximately 2% higher than the Ohio average of 39. In Madison, 64% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 83% of Madison residents were born in Ohio, 14% were born out of state, 0% were born outside of the United States and 2% were foreign born.