Carbondale is a Home Rule Municipality in Garfield County, Colorado, United States. The town population was 6,427 at the 2010 United States Census. The town is located in the Roaring Fork Valley, downstream from Aspen and upstream from the mouth of the Roaring Fork River at Glenwood Springs. The town proper sits on the south bank of the river, at the confluence of the Crystal River. Carbondale's horizon is dominated by the 12,953 ft tall Mount Sopris several miles to the south of town.