Counties in Idaho

• Ada (154 historic properties)
• Adams (7 historic properties)
• Bannock (29 historic properties)
• Bear Lake (92 historic properties)
• Benewah (8 historic properties)
• Bingham (16 historic properties)
• Blaine (21 historic properties)
• Boise (4 historic properties)
• Bonner (17 historic properties)
• Bonneville (30 historic properties)
• Boundary (8 historic properties)
• Butte (4 historic properties)
• Camas (1 historic property)
• Canyon (42 historic properties)
• Caribou (8 historic properties)
• Cassia (7 historic properties)
• Clark (4 historic properties)
• Clearwater (8 historic properties)
• Custer (37 historic properties)
• Elmore (21 historic properties)
• Franklin (10 historic properties)
• Fremont (12 historic properties)

• Gem (10 historic properties)
• Gooding (13 historic properties)
• Idaho (36 historic properties)
• Jefferson (5 historic properties)
• Jerome (64 historic properties)
• Kootenai (42 historic properties)
• Latah (49 historic properties)
• Lemhi (15 historic properties)
• Lewis (3 historic properties)
• Lincoln (42 historic properties)
• Madison (3 historic properties)
• Minidoka (4 historic properties)
• Nez Perce (30 historic properties)
• Oneida (7 historic properties)
• Owyhee (13 historic properties)
• Payette (14 historic properties)
• Power (13 historic properties)
• Shoshone (23 historic properties)
• Teton (5 historic properties)
• Twin Falls (38 historic properties)
• Valley (23 historic properties)
• Washington (29 historic properties)