Northfield is a village in Cook County, Illinois, United States, located approximately north of downtown Chicago. As of the 2020 census, the village's population was 5,751. It is part of a collection of upscale residential communities north of Chicago that belong to New Trier and Northfield Townships and the greater North Shore. Geography Northfield is located in Northfield Township, Cook County at 42°6'N 87°46'W (42.10,-87.77). According to the 2021 census gazetteer files, Northfield has a total area of , all land. Demographics As of the 2020 census there were 5,751 people, 2,407 households, and 1,710 families residing in the village. The population density was . There were 2,420 housing units at an average density of . The racial makeup of the village was 82.84% White, 0.47% African American, 0.16% Native American, 9.23% Asian, 0.03% Pacific Islander, 0.78% from other races, and 6.49% from two or more races. Hispanic or Latino of any race were 4.83% of the population. There were 2,407 households, out of which 42.42% had children under the age of 18 living with them, 59.53% were married couples living together, 9.35% had a female householder with no husband present, and 28.96% were non-families. 27.30% of all households were made up of individuals, and 15.70% had someone living alone who was 65 years of age or older. The average household size was 2.89 and the average family size was 2.36. The village's age distribution consisted of 18.8% under the age of 18, 4.4% from 18 to 24, 16.3% from 25 to 44, 32.1% from 45 to 64, and 28.3% who were 65 years of age or older. The median age was 52.3 years. For every 100 females, there were 85.4 males. For every 100 females age 18 and over, there were 88.4 males. The median income for a household in the village was $143,661, and the median income for a family was $200,132. Males had a median income of $89,089 versus $56,364 for females. The per capita income for the village was $103,893. About 8.7% of families and 8.3% of the population were below the poverty line, including 14.6% of those under age 18 and 4.7% of those age 65 or over. Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race. Government Northfield is represented by Democrat