
Altona
- County:
- Boulder County
- County Seat:
- No
- Area (mi²):
- 1.686
- State:
- Colorado
Altona is a CDP located in Boulder County, Colorado. Altona has a 2025 population of 538. Altona is currently growing at a rate of 0.37% annually and its population has increased by 12.32% since the most recent census, which recorded a population of 479 in 2020.
The average household income in Altona is $378,012 with a poverty rate of 4.51%. The median age in Altona is 52.9 years: 52.7 years for males, and 55.3 years for females.