Plainwell is a city in Allegan County in the U.S. state of Michigan. The population was 3,804 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 2.06 square miles (5.34 km), of which 1.98 square miles (5.13 km) is land and 0.08 square miles (0.21 km) is water. The nickname Island City has to do with a power canal which diverts a portion of the Kalamazoo River around the downtown area, causing it to be an island.
As of the census of 2010, there were 3,804 people, 1,561 households, and 966 families residing in the city. The population density was 1,921.2 inhabitants per square mile (741.8/km). There were 1,674 housing units at an average density of 845.5 per square mile (326.4/km). The racial makeup of the city was 96.0% White, 1.0% African American, 0.5% Native American, 0.4% Asian, 0.1% Pacific Islander, 0.6% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 2.3% of the population.
There were 1,561 households of which 32.4% had children under the age of 18 living with them, 44.3% were married couples living together, 13.6% had a female householder with no husband present, 4.0% had a male householder with no wife present, and 38.1% were non-families. 33.1% of all households were made up of individuals and 12.1% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.97.
The median age in the city was 38.7 years. 23.8% of residents were under the age of 18; 9.4% were between the ages of 18 and 24; 24.2% were from 25 to 44; 26.6% were from 45 to 64; and 15.9% were 65 years of age or older. The gender makeup of the city was 46.7% male and 53.3% female.
As of the census of 2000, there were 3,933 people, 1,506 households, and 1,018 families residing in the city. The population density was 1,897.9 per square mile (733.6/km²). There were 1,593 housing units at an average density of 768.7 per square mile (297.1/km²). The racial makeup of the city was 96.77% White, 0.46% African American, 0.48% Native American, 0.36% Asian, 0.66% from other races, and 1.27% from two or more races. Hispanic or Latino of any race were 1.65% of the population.
There were 1,506 households out of which 35.7% had children under the age of 18 living with them, 50.7% were married couples living together, 13.1% had a female householder with no husband present, and 32.4% were non-families. 26.8% of all households were made up of individuals and 10.0% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.01.
In the city, the population was spread out with 26.5% under the age of 18, 7.9% from 18 to 24, 30.2% from 25 to 44, 19.8% from 45 to 64, and 15.7% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 91.3 males. For every 100 females age 18 and over, there were 87.5 males.
The median income for a household in the city was $39,590, and the median income for a family was $44,519. Males had a median income of $35,785 versus $26,397 for females. The per capita income for the city was $16,982. About 1.4% of families and 6.1% of the population were below the poverty line, including 2.6% of those under age 18 and 18.8% of those age 65 or over.
Plainwell Michigan neighborhoods include: Ayres, Cooper North, Doster, Gun River Plat, Plainwell East Side, Plainwell West, Rushing Dr, West Pine Lake, Zak Rd/Allegan St