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