| | 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 |
| | El Paso County | CO | 08041 | | Colorado Springs, CO 17820 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ElPasoCounty+CO |
| | Jefferson County | CO | 08059 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=JeffersonCounty+CO |
| | Las Animas County | CO | 08071 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LasAnimasCounty+CO |
| | Mesa County | CO | 08077 | | Grand Junction, CO 24300 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MesaCounty+CO |
| | Montezuma County | CO | 08083 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MontezumaCounty+CO |
| | Montrose County | CO | 08085 | | Montrose, CO 33940 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MontroseCounty+CO |