Winfield is located at . According to the 2010 census, Winfield has a total area of, of which is land and is water.
Demographics
2010 census
As of the census of 2010, there were 4,383 people, 1,427 households, and 1,144 families living in the town. The population density was. There were 1,511 housing units at an average density of. The racial makeup of the town was 88.5% White, 3.7% African American, 0.4% Native American, 3.5% Asian, 2.5% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 8.9% of the population. There were 1,427 households of which 44.4% had children under the age of 18 living with them, 70.7% were married couplesliving together, 6.2% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 19.8% were non-families. 16.4% of all households were made up of individuals and 7.1% had someone living alone who was 65 years of age or older. The average household size was 3.00 and the average family size was 3.39. The median age in the town was 38.7 years. 29% of residents were under the age of 18; 5.8% were between the ages of 18 and 24; 25.9% were from 25 to 44; 26.1% were from 45 to 64; and 13% were 65 years of age or older. The gender makeup of the town was 48.7% male and 51.3% female.
The median income for a household in the town was $65,641, and the median income for a family was $70,489. Males had a median income of $52,143 versus $28,516 for females. The per capita income for the town was $24,765. About 0.9% of families and 2.8% of the population were below the poverty line, including 2.4% of those under age 18 and 8.5% of those age 65 or over.
2000 census
As of the census of 2000, there were 2,298 people, 692 households, and 581 families living in the town. The population density was 186.9 people per square mile. There were 748 housing units at an average density of 60.8 per square mile. The racial makeup of the town was 95.13% White, 0.35% African American, 0.26% Native American, 0.65% Asian, 1.44% from other races, and 2.18% from two or more races. Hispanic or Latino of any race were 4.26% of the population. There were 692 households out of which 46.8% had children under the age of 18 living with them, 77.5% were married couples living together, 4.0% had a female householder with no husband present, and 16.0% were non-families. 12.4% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 3.08 and the average family size was 3.40. In the town, the population was spread out with 28.7% under the age of 18, 5.8% from 18 to 24, 33.7% from 25 to 44, 17.8% from 45 to 64, and 13.9% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 93.3 males. For every 100 females age 18 and over, there were 87.8 males.
Education
Winfield has a public library, a branch of the Crown Point Community Public Library.