Mason City is a city located in Iowa. With a 2020 population of 26,975, it is the 17th largest city in Iowa and the 1419th largest city in the United States. Mason City is currently declining at a rate of -0.22% annually and its population has decreased by -3.93% since the most recent census, which recorded a population of 28,079 in 2010. Mason City reached it's highest population of 30,642 in 1960. Spanning over 28 miles, Mason City has a population density of 971 people per square mile.
The average household income in Mason City is $63,515 with a poverty rate of 12.81%. The median rental costs in recent years comes to $708 per month, and the median house value is $110,200. The median age in Mason City is 42.2 years, 39.9 years for males, and 44 years for females. For every 100 females there are 92.9 males.