A destructive F4 tornado killed three people and destroyed a large part of Manson on June 28, 1979 at about 7:45 PM. The tornado slowly chewed its way from northwest to southeast through Manson. The tornado was on the southwest side of a large southeast-moving thunderstorm complex, thus it was surrounded on three sides by clear skies and was highly visible. Severe damage was done to the central business district with 25 of the 35 business either destroyed or severely damaged. The middle school was also destroyed as were about 110 homes. Another 139 homes were damaged. The General Telephone Company exchange building for Manson was completely destroyed - the first time this had ever happened in Iowa. It was reported that the storm was like a lawn mower going through the city, and afterwards one could see from one end of the city to the other when looking up the damage track. There was about 30 minutes warning and the tornado sirens were sounded well before the arrival of the tornado. The fact that it was still daylight also contributed to the relatively low death count from this destructive storm.
Geography
Manson is located at . According to the United States Census Bureau, the city has a total area of, all land.
Manson is located near the site of the Manson crater, formed by a meteorite collision that happened 74 million years ago. The crater's existence was first discovered during an oil-drilling wildcatting expedition in the 1930s. At one time, it was thought to be the biggest impact by an object from outer space in North America, until subsequent studies revealed larger examples. The impact event was also once theorized to have led to the extinction of the dinosaurs, or contributed to it as a fragment of the Chicxulub meteor, until tests by the U.S. Geological Survey in 1991 and 1992 proved that it was too old by 9 million years. Not much remains due to glacial till which has filled in the crater and has made it undetectable at ground level. However, due to this infilling it is one of the best preserved impact sites on Earth. The impact crater measures approximately in diameter and the city of Manson is located near the center of the impact site.
Demographics
2010 census
At the 2010 census there were 1,690 people, 771 households, and 483 families living in the city. The population density was. There were 860 housing units at an average density of. The racial makup of the city was 99.2% White, 0.2% Native American, 0.2% from other races, and 0.4% from two or more races. Hispanic or Latino of any race were 0.8%. Of the 771 households 25.6% had children under the age of 18 living with them, 50.2% were married couples living together, 9.3% had a female householder with no husband present, 3.1% had a male householder with no wife present, and 37.4% were non-families. 34.6% of households were one person and 19.7% were one person aged 65 or older. The average household size was 2.14 and the average family size was 2.73. The median age was 47.2 years. 20.5% of residents were under the age of 18; 6.8% were between the ages of 18 and 24; 19.8% were from 25 to 44; 27.1% were from 45 to 64; and 25.9% were 65 or older. The gender makeup of the city was 47.0% male and 53.0% female.
At the 2000 census there were 1,893 people, 814 households, and 529 families living in the city. The population density was 592.8 people per square mile. There were 863 housing units at an average density of 270.2 per square mile. The racial makup of the city was 98.68% White, 0.16% African American, 0.21% Native American, 0.32% Asian, 0.32% from other races, and 0.32% from two or more races. Hispanic or Latino of any race were 0.37%. Of the 814 households 27.4% had children under the age of 18 living with them, 53.8% were married couples living together, 8.7% had a female householder with no husband present, and 34.9% were non-families. 32.7% of households were one person and 21.0% were one person aged 65 or older. The average household size was about 2.27 and the average family size was approximately 2.87. The age distribution was23.7% under the age of 18, 6.9% from 18 to 24, 22.5% from 25 to 44, 21.4% from 45 to 64, and 25.4% 65 or older. The median age was 44 years. For every 100 females, there were 86.0 males. For every 100 females age 18 and over, there were 79.8 males. The median household income was $31,331 and the median family income was $41,500. Males had a median income of $31,006 versus $20,491 for females. The per capita income for the city was $16,687. About 6.7% of families and 8.9% of the population were below the poverty line, including 11.9% of those under age 18 and 7.7% of those age 65 or over.
