Counties in Colorado

• Adams (14 historic properties)
• Alamosa (15 historic properties)
• Arapahoe (20 historic properties)
• Archuleta (3 historic properties)
• Baca (4 historic properties)
• Bent (6 historic properties)
• Boulder (85 historic properties)
• Chaffee (26 historic properties)
• Cheyenne (2 historic properties)
• Clear Creek (25 historic properties)
• Conejos (9 historic properties)
• Costilla (6 historic properties)
• Crowley (1 historic property)
• Custer (9 historic properties)
• Delta (14 historic properties)
• Denver (290 historic properties)
• Dolores (5 historic properties)
• Douglas (26 historic properties)
• Eagle (11 historic properties)
• El Paso (87 historic properties)
• Elbert (1 historic property)
• Fremont (23 historic properties)
• Garfield (17 historic properties)
• Gilpin (4 historic properties)
• Grand (21 historic properties)
• Gunnison (21 historic properties)
• Hinsdale (11 historic properties)
• Huerfano (7 historic properties)
• Jackson (2 historic properties)
• Jefferson (78 historic properties)
• Kiowa (2 historic properties)
• Kit Carson (7 historic properties)

• La Plata (13 historic properties)
• Lake (9 historic properties)
• Larimer (95 historic properties)
• Las Animas (25 historic properties)
• Lincoln (2 historic properties)
• Logan (10 historic properties)
• Mesa (32 historic properties)
• Mineral (2 historic properties)
• Moffat (13 historic properties)
• Montezuma (31 historic properties)
• Montrose (26 historic properties)
• Morgan (15 historic properties)
• Otero (15 historic properties)
• Ouray (4 historic properties)
• Park (20 historic properties)
• Phillips (5 historic properties)
• Pitkin (36 historic properties)
• Prowers (15 historic properties)
• Pueblo (64 historic properties)
• Rio Blanco (10 historic properties)
• Rio Grande (13 historic properties)
• Routt (20 historic properties)
• Saguache (8 historic properties)
• San Juan (9 historic properties)
• San Miguel (6 historic properties)
• Sedgwick (2 historic properties)
• Summit (7 historic properties)
• Teller (10 historic properties)
• Washington (3 historic properties)
• Weld (40 historic properties)
• Yuma (4 historic properties)