Denison, Iowa

According to the Köppen Climate Classification system, Denison has a hot-summer humid continental climate, abbreviated "Dfa" on climate maps.

As of the 2020 census, there were 8,373 people, 2,853 households, and 1,882 families residing in the city.^[12][13] The population density was 1,278.9 inhabitants per square mile (493.8/km²). There were 3,089 housing units at an average density of 471.8 per square mile (182.2/km²), of which 7.6% were vacant. The homeowner vacancy rate was 1.4% and the rental vacancy rate was 8.8%.^[12]

Of the 2,853 households, 39.2% had children under the age of 18 living with them, 46.0% were married-couple households, 6.8% were cohabitating couples, 27.3% had a female householder with no spouse or partner present, and 19.9% had a male householder with no spouse or partner present. Non-family households made up 34.0% of all households. Individuals made up 29.7% of all households, and 16.2% had someone living alone who was 65 years of age or older.^[12]

The median age was 32.1 years. 30.2% of residents were under the age of 18 and 14.6% were 65 years of age or older. By broader age cohorts, 34.2% of residents were under the age of 20, 7.1% were between the ages of 20 and 24, 23.0% were from 25 to 44, and 21.1% were from 45 to 64. The gender makeup of the city was 49.7% male and 50.3% female. For every 100 females, there were 98.6 males, and for every 100 females age 18 and over, there were 99.2 males age 18 and over.^[12]

96.9% of residents lived in urban areas, while 3.1% lived in rural areas.^[14]

At the 2010 census there were 8,298 people, 2,816 households, and 1,866 families living in the city. The population density was 1,268.8 inhabitants per square mile (489.9/km²). There were 2,968 housing units at an average density of 453.8 per square mile (175.2/km²). The racial makeup of the city was 70.6% White, 2.3% African American, 0.6% Native American, 1.0% Asian, 0.2% Pacific Islander, 23.0% from other races, and 2.3% from two or more races. Hispanic or Latino of any race were 42.1%.^[15]

Of the 2,816 households 38.0% had children under the age of 18 living with them, 48.8% were married couples living together, 11.1% had a female householder with no husband present, 6.4% had a male householder with no wife present, and 33.7% were non-families. 28.1% of households were one person and 13.7% were one person aged 65 or older. The average household size was 2.75 and the average family size was 3.36.

The median age was 32.6 years. 29% of residents were under the age of 18; 11.3% were between the ages of 18 and 24; 24.5% were from 25 to 44; 21.3% were from 45 to 64; and 13.9% were 65 or older. The gender makeup of the city was 50.7% male and 49.3% female.

As of the census^[16] of 2000, there were 7,339 people, 2,674 households, and 1,756 families living in the city. The population density was 1,185.5 inhabitants per square mile (457.7/km²). There were 2,837 housing units at an average density of 458.3 per square mile (177.0/km²). The racial makeup as reported by the Census was 86.92% White, 1.59% African American, 0.45% Native American, 0.82% Asian, 0.01% Pacific Islander, 9.02% from other races, and 1.19% from two or more races. Hispanic or Latino of any race were 17.36% of the population.

Racial diversity in Dension has been increasing since the mid-1980s. According to a New York Times article, 20% of Denison's high-school age children were nonwhite in 2005, compared to approximately 50% of kindergarteners.^[17]

Of the 2,674 households 31.7% had children under the age of 18 living with them, 51.9% were married couples living together, 9.1% had a female householder with no husband present, and 34.3% were non-families. 28.9% of households were one person and 15.0% were one person aged 65 or older. The average household size was 2.53 and the average family size was 3.08.

The age distribution was26.0% under the age of 18, 11.2% from 18 to 24, 26.3% from 25 to 44, 19.3% from 45 to 64, and 17.2% 65 or older. The median age was 35 years. For every 100 females, there were 95.3 males. For every 100 females age 18 and over, there were 92.3 males.

The median household income was $33,187 and the median family income was $41,362. Males had a median income of $30,145 versus $20,538 for females. The per capita income for the city was $15,391. About 6.1% of families and 12.1% of the population were below the poverty line, including 9.7% of those under age 18 and 4.2% of those age 65 or over.