| | | Boundary County | ID | 16021 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BoundaryCounty+ID |
| | | Butte County | ID | 16023 | | Idaho Falls, ID 26820 | Idaho
Falls-Rexburg-Blackfoot,
ID 292 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=ButteCounty+ID |
| | | Camas County | ID | 16025 | | Hailey, ID 25200 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CamasCounty+ID |
| | | Canyon County | ID | 16027 | | Boise City, ID 14260 | Boise City-Mountain
Home-Ontario, ID-OR 147 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=CanyonCounty+ID |
| | | Caribou County | ID | 16029 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CaribouCounty+ID |
| | | Cassia County | ID | 16031 | | Burley, ID 15420 | | Central | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CassiaCounty+ID |
| | | Clark County | ID | 16033 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ClarkCounty+ID |
| | | Clearwater County | ID | 16035 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ClearwaterCounty+ID |
| | | Custer County | ID | 16037 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=CusterCounty+ID |
| | | Elmore County | ID | 16039 | | Mountain Home, ID 34300 | Boise City-Mountain
Home-Ontario, ID-OR 147 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ElmoreCounty+ID |
