Dayton, OH has a population of 141,776 and is the 183rd largest city in the United States. The population density is 2,547 per sq mi which is 802% higher than the Ohio average and 2711% higher than the national average. The median age in Dayton is 34 which is approximately 14% lower than the Ohio average of 39. In Dayton, 35% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 70% of Dayton residents were born in Ohio, 25% were born out of state, 1% were born outside of the United States and 4% were foreign born.