| | | Adams County | CO | 08001 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=AdamsCounty+CO |
| | | Arapahoe County | CO | 08005 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=ArapahoeCounty+CO |
| | | Boulder County | CO | 08013 | | Boulder, CO 14500 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 250k
< 1m | nonspecialized | https://maps.google.com/?q=BoulderCounty+CO |
| | | Broomfield County | CO | 08014 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=BroomfieldCounty+CO |
| | | Clear Creek County | CO | 08019 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Outlying | in metro of > 1m | mining-dependent | https://maps.google.com/?q=ClearCreekCounty+CO |
| | | Denver County | CO | 08031 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=DenverCounty+CO |
| | | Douglas County | CO | 08035 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=DouglasCounty+CO |
| | | Elbert County | CO | 08039 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Outlying | in metro of > 1m | farm-dependent | https://maps.google.com/?q=ElbertCounty+CO |
| | | Gilpin County | CO | 08047 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Outlying | in metro of > 1m | recreation | https://maps.google.com/?q=GilpinCounty+CO |
| | | Jefferson County | CO | 08059 | | Denver-Aurora-Centennial,
CO 19740 | Denver-Aurora-Greeley, CO 216 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=JeffersonCounty+CO |
