Blue Valley is an unincorporated community and a census-designated place (CDP) located in Clear Creek County, Colorado, United States.

[4] The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area.

Blue Valley has never had a post office,[6] but the Idaho Springs post office (Zip Code 80452) serves the area.

[5] At the 2020 United States Census, the Blue Valley CDP had an area of 673 acres (2.725 km2), all land.

[3] The United States Census Bureau defined the Blue Valley CDP for the United States Census 2020.