Belmont, officially known as the "Belmont Site," is an unincorporated area of approximately 40 square miles in extreme western Gonzales County, Texas, United States, adjacent to Greater Austin, north of the "Belmont intersection" at the “Leesville Quad” water-testing site, electorally known as local Precinct 5. The population of Belmont-proper has been rate…Belmont, officially known as the "Belmont Site," is an unincorporated area of approximately 40 square miles in extreme western Gonzales County, Texas, United States, adjacent to Greater Austin, north of the "Belmont intersection" at the “Leesville Quad” water-testing site, electorally known as local Precinct 5. The population of Belmont-proper has been rated at 36 employees, with the greater area rated at 1,169 residents. The area is defined by the limits of the northern and western county line, bordered by the significant 1800s land grants of Eliza Dewitt, Ira Nash, Samuel Robbins and Thomas Decrew. It is served by the Belmont Volunteer Fire Department.