As of the census of 2010, there were 495 people, 196 households, and 133 families living in the city. The population density was. There were 219 housing units at an average density of. The racial makeup of the city was 99.0% White, 0.2% Asian, and 0.8% from two or more races. Hispanic or Latino of any race were 0.2% of the population. There were 196 households, of which 37.2% had children under the age of 18 living with them, 50.5% were married couplesliving together, 10.7% had a female householder with no husband present, 6.6% had a male householder with no wife present, and 32.1% were non-families. 31.1% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.11. The median age in the city was 35.2 years. 31.1% of residents were under the age of 18; 4.9% were between the ages of 18 and 24; 27% were from 25 to 44; 20.8% were from 45 to 64; and 16.4% were 65 years of age or older. The gender makeup of the city was 49.9% male and 50.1% female.
2000 census
As of the census of 2000, there were 499 people, 207 households, and 129 families living in the city. The population density was 1,013.9 people per square mile. There were 222 housing units at an average density of 451.1 per square mile. The racial makeup of the city was 99.00% White, 0.20% from other races, and 0.80% from two or more races. Hispanic or Latino of any race were 1.00% of the population. There were 207 households, out of which 26.1% had children under the age of 18 living with them, 54.1% were married couples living together, 5.8% had a female householder with no husband present, and 37.2% were non-families. 31.9% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.06. In the city, the population was spread out, with 25.7% under the age of 18, 8.2% from 18 to 24, 26.7% from 25 to 44, 19.8% from 45 to 64, and 19.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 94.2 males. For every 100 females age 18 and over, there were 89.3 males. The median income for a household in the city was $37,917, and the median income for a family was $42,422. Males had a median income of $29,904 versus $23,229 for females. The per capita income for the city was $20,284. About 3.7% of families and 5.0% of the population were below the poverty line, including none of those under age 18 and 7.7% of those age 65 or over.
Community
Collins has an annual celebration named "Collins' Day" which typically is celebrated with a parade, softball game, and a dance. This celebration is usually held on the last weekend in June. Collins recently added a community wellness center on Main Street. Iowa Highway 210 starts south of town and runs west to Maxwell and ultimately ends in Woodward. Collins is featured in John Darnielle's 2017 novel Universal Harvester.
