Johnston is located in Iowa. Johnston, Iowa has a population of 23,418. Johnston is more family-centric than the surrounding county with 37.41% of the households containing married families with children. The county average for households married with children is 34.53%.
The median household income in Johnston, Iowa is $93,363. The median household income for the surrounding county is $73,015 compared to the national median of $69,021. The median age of people living in Johnston is 37.7 years.
The average high temperature in July is 85.7 degrees, with an average low temperature in January of 12.5 degrees. The average rainfall is approximately 35.9 inches per year, with 34.1 inches of snow per year.
