| | Laramie County | WY | 56021 | | Cheyenne, WY 16940 | | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=LaramieCounty+WY |
| | Lincoln County | WY | 56023 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=LincolnCounty+WY |
| | Natrona County | WY | 56025 | | Casper, WY 16220 | | Central | metro county (urban) | mining-dependent | https://maps.google.com/?q=NatronaCounty+WY |
| | Niobrara County | WY | 56027 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=NiobraraCounty+WY |
| | Park County | WY | 56029 | | Cody, NM 17650 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=ParkCounty+WY |
| | Platte County | WY | 56031 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=PlatteCounty+WY |
| | Sheridan County | WY | 56033 | | Sheridan, WY 43260 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=SheridanCounty+WY |
| | Sublette County | WY | 56035 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SubletteCounty+WY |
| | Sweetwater County | WY | 56037 | | Rock Springs, WY 40540 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SweetwaterCounty+WY |
| | Teton County | WY | 56039 | | Jackson, WY-ID 27220 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=TetonCounty+WY |