| | San Juan County | CO | 08111 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=SanJuanCounty+CO |
| | San Miguel County | CO | 08113 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=SanMiguelCounty+CO |
| | Sedgwick County | CO | 08115 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=SedgwickCounty+CO |
| | Summit County | CO | 08117 | | Breckenridge, CO 14720 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=SummitCounty+CO |
| | Teller County | CO | 08119 | | Colorado Springs, CO 17820 | | Outlying | metro county (urban) | recreation | https://maps.google.com/?q=TellerCounty+CO |
| | 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 |
| | 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 |