Mentor-on-the-Lake is a somewhat small city located in the state of Ohio. With a population of 7,090 people and two associated neighborhoods, Mentor-on-the-Lake is the 215th largest community in Ohio.

The citizens of Mentor-on-the-Lake are slightly better educated than the national average of 21.84% for all cities and towns, with 22.62% of adults in Mentor-on-the-Lake having a bachelor's degree or advanced degree.

The per capita income in Mentor-on-the-Lake in 2022 was $37,530, which is upper middle income relative to Ohio and the nation. This equates to an annual income of $150,120 for a family of four. However, Mentor-on-the-Lake contains both very wealthy and poor people as well.

The people who call Mentor-on-the-Lake home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Mentor-on-the-Lake residents report their race to be White, followed by Black or African-American. Important ancestries of people in Mentor-on-the-Lake include German, Irish, Italian, English, and Polish.

The most common language spoken in Mentor-on-the-Lake is English. Other important languages spoken here include Slavic languages and Italian.