Mentor is a home rule-class city in Campbell County, Kentucky, United States. The population was 218 as of the 2020 census. According to …Mentor is a home rule-class city in Campbell County, Kentucky, United States. The population was 218 as of the 2020 census. According to the United States Census Bureau, the city has a total area of 0.6 square miles, of which 0.5 square miles is land and 0.04 square miles is water.
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