| | | Washington County | CO | 08121 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=WashingtonCounty+CO |
| | | Yuma County | CO | 08125 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=YumaCounty+CO |
| | | Adams County | CO | 08001 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=AdamsCounty+CO |
| | | Alamosa County | CO | 08003 | | Alamosa, CO 10480 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=AlamosaCounty+CO |
| | | Arapahoe County | CO | 08005 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ArapahoeCounty+CO |
| | | Boulder County | CO | 08013 | | Boulder, CO 14500 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BoulderCounty+CO |
| | | Broomfield County | CO | 08014 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BroomfieldCounty+CO |
| | | Denver County | CO | 08031 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DenverCounty+CO |
| | | Douglas County | CO | 08035 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DouglasCounty+CO |
| | | Eagle County | CO | 08037 | | Edwards, CO 20780 | Edwards-Rifle, CO 233 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=EagleCounty+CO |
