Altona, Colorado

Altona is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Altona CDP was 512 at the United States Census 2020. The Boulder post office (Zip Code 80302) serves the area.

Geography
Altona is located in central Boulder County where Left Hand Creek exits the Front Range of the Colorado Rockies. U.S. Highway 36 passes through the community, leading north to Lyons and south to Boulder. Altona is 10 mi west of Longmont by Nelson Road.

The Altona CDP has an area of 4.515 km2 including 0.149 km2 of water.

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