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.
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History
The Altona, Colorado, post office operated from October 2, 1879, until July 15, 1916.
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 miles (16 km) west of Longmont by Nelson Road.
The Altona CDP has an area of 1,116 acres (4.515 km2) including 37 acres (0.149 km2) of water.
Demographics
The United States Census Bureau initially defined the Altona CDP for the United States Census 2010.