Marshalltown 50158 Real EstateMarshalltown is located in Iowa. Marshalltown, Iowa 50158has a population of 27,570. Marshalltown 50158 is more family-centric than the surrounding county with 35.82% of the households containing married families with children. The county average for households married with children is 34.8%. The median household income in Marshalltown, Iowa 50158 is $57,367. The median household income for the surrounding county is $63,591 compared to the national median of $69,021. The median age of people living in Marshalltown 50158 is 36 years. Marshalltown WeatherThe average high temperature in July is 83.7 degrees, with an average low temperature in January of 9.6 degrees. The average rainfall is approximately 35.6 inches per year, with 25.5 inches of snow per year. Marshalltown MapReal estate near MarshalltownNearby CitiesNearby Cities Homes for Sale |