Mentor-on-the-Lake, OH has a population of 7,404 and is the 4,978th largest city in the United States. The population density is 4,590 per sq mi which is 1682% higher than the Ohio average and 4966% higher than the national average. The median age in Mentor-on-the-Lake is 41 which is approximately 5% higher than the Ohio average of 39. In Mentor-on-the-Lake, 55% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 77% of Mentor-on-the-Lake residents were born in Ohio, 19% were born out of state, 1% were born outside of the United States and 3% were foreign born.