Mentor, OH has a population of 46,896 and is the 881st largest city in the United States. The population density is 1,687 per sq mi which is 555% higher than the Ohio average and 1762% higher than the national average. The median age in Mentor is 47 which is approximately 19% higher than the Ohio average of 39. In Mentor, 65% of the population over 15 years of age are married, 95% speak English and 1% speak Spanish. 78% of Mentor residents were born in Ohio, 17% were born out of state, 0% were born outside of the United States and 4% were foreign born.