Fairmount is an unincorporated community and a census-designated place (CDP) in Jefferson County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The population of the Fairmount CDP was 9,324 at the United States Census 2010. ZIP code 80403 applies to addresses in Fairmount.

Fairmount is bordered to the north by Arvada, to the east by Wheat Ridge, to the south by unincorporated Applewood, and to the west by Golden and undeveloped land on North Table Mountain.

The southeast corner of the Fairmount CDP touches Interstate 70, which leads east 8 miles (13 km) into Denver.

The Fairmount CDP has an area of 4,020 acres (16.267 km), including 126 acres (0.509 km) of water.

The United States Census Bureau initially defined the Fairmount CDP for the United States Census 2010.

Fairmount CDP, Colorado

Year	Pop.	±%
2010	7,559	—
2020	9,324	+23.3%
Source: United States Census Bureau

Fairmount is served by the Jefferson County Public Schools.

• Outline of Colorado
  • Index of Colorado-related articles
• State of Colorado
  • Colorado cities and towns
    • Colorado census designated places
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    • Jefferson County, Colorado
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    • Front Range Urban Corridor
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    • Denver-Aurora-Boulder, CO Combined Statistical Area
    • Denver-Aurora-Broomfield, CO Metropolitan Statistical Area

• Fairmount Fire Protection District
• Prospect Recreation & Park District
• Jefferson County website
• Jeffco Public Schools