Mason City is a city located in Mason County Illinois. Mason City has a 2020 population of 2,318. Mason City is currently declining at a rate of -1.40% annually and its population has decreased by -11.86% since the most recent census, which recorded a population of 2,630 in 2010. Mason City reached it's highest population of 2,630 in 2010.
The average household income in Mason City is $69,930 with a poverty rate of 18.90%. The median rental costs in recent years comes to $596 per month, and the median house value is $80,100. The median age in Mason City is 45.1 years, 42.3 years for males, and 47 years for females.