Eagle County

Eagle County covers 1,701 square miles and makes up 25% of the region. Incorporated towns in Eagle County:

Grand County

Grand County covers 1,869 square miles and makes up 28% of the region. Incorporated towns in Grand County:

Jackson County

Jackson County covers 1,613 square miles and makes up 24% of the region. Incorporated towns in Jackson County:

Pitkin County

Pitkin County covers 975 square miles and makes up 14% of the region. Incorporated towns in Pitkin County include:

Summit County

Summit County covers 619 square miles and makes up 9% of the region. Incorporated towns in Summit County:

Communities outside Region 12:

While not part of the officially designed EDD region (i.e. Colorado Planning and Management Region 12), these two communities are members of NWCCOG: