Cahas Mountain Rural Historic District is a national historic district located near Boones Mill, Franklin County, Virginia. It encompasses 33 contributing buildings, 10 contributing sites, and 8 contributing structures. Most historic (above-ground) resources are associated with the four farms that compose the district. They include the John and Susan Boon House (c. 1820), Taylor-Price House (c. 1821, c. 1850), Boon-Garst House (1902, 1945-1946), and Washington and Rinda Boon House (1889). The historic sites include the Boone Cemetery (1911).