Mentor is a city in Polk County, Minnesota, United States.

[7] According to the United States Census Bureau, the city has a total area of 1.905 square miles (4.93 km2), all land.

The racial makeup of the city was 96.7% White, 1.3% Native American, and 2.0% from two or more races.

43.0% of all households were made up of individuals, and 21.5% had someone living alone who was 65 years of age or older.

41.5% of all households were made up of individuals, and 26.8% had someone living alone who was 65 years of age or older.

There were 3.6% of families and 13.5% of the population living below the poverty line, including no under eighteens and 29.4% of those over 64.