Mentone is a census-designated place in Loving County, Texas. As the county's only community, it serves as the county seat and has a 2010 population of 19, almost a quarter of the county's 82 people. Mentone was until recently the least-populated unincorporated county seat in the United States, but lost that distinction with the 2010 census to Gann Valley, South Dakota, which has a population of 14. It was designated a Recorded Texas Historic Landmark in 1967 as the "Smallest County Seat in Texas".