Altona is a city located in Knox County Illinois. With a 2020 population of 493, it is the 875th largest city in Illinois and the 13367th largest city in the United States . Altona is currently declining at a rate of -0.40% annually and its population has decreased by -7.16% since the most recent census, which recorded a population of 531 in 2010. Altona reached it's highest population of in . Spanning over 1 miles, Altona has a population density of 525 people per square mile.
The average household income in Altona is $63,335 with a poverty rate of 10.35%. The median rental costs in recent years comes to $653 per month, and the median house value is $67,900. The median age in Altona is 32.9 years, 30.5 years for males, and 36.5 years for females.