U.S. Highway 6 (US 6) is a part of the United States Numbered Highway System that travels from Bishop, California, to Provincetown, Massachusetts. In the U.S. state of Colorado, US 6 is an east–west highway stretching from Utah to Nebraska. Much of the route overlaps other highways in Colorado, and, as a result, much of US 6 is unsigned.

Quick Facts Route information, Length ...

U.S. Highway 6
Grand Army of the Republic Highway
US 6 highlighted in red
Route information
Maintained by CDOT
Length	467.284 mi[1] (752.021 km)
Major junctions
West end	I-70 / US 6 / US 50 at the Utah state line
Major intersections	US 50 in Grand Junction US 24 in Minturn US 40 near Empire SH 470 near Golden I-25 / US 85 / US 87 / US 287 in Denver I-270 in Commerce City I-76 from Commerce City to Fort Morgan US 34 in Fort Morgan US 385 in Holyoke
East end	US 6 at the Nebraska state line
Location
Country	United States
State	Colorado
Counties	Mesa, Garfield, Eagle, Summit, Clear Creek, Jefferson, Denver, Adams, Weld, Morgan, Washington, Logan, Phillips
Highway system
United States Numbered Highway System List Special Divided Colorado State Highway System Interstate US State Scenic
← SH 5 → SH 7

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US 6 is concurrent with Interstate 70 (I-70) for a significant portion of its length from the Utah state line to Denver. When the highway enters the western Denver suburbs, US 6 coincidentally aligns with 6th Avenue in the grid system, where it is known as 6th Avenue Freeway. Once it reaches I-25, US 6 travels north briefly, then follows I-76 for most of its length east of Denver. It is unsigned while it is overlapped.

The highest altitude along US 6 is 11,990 feet (3,650 m) at Loveland Pass, where it crosses the Continental Divide. It continues down the Clear Creek valley until it reaches I-70, where it is briefly overlapped until I-70 leaves the Clear Creek valley. US 6 continues down Clear Creek and into Denver, where it turns into a freeway with six lanes. East of Denver, it continues east while joined with I-76 until it reaches Sterling, where it diverges from the Interstate. The last town in Colorado through which it passes is Holyoke.