Northfield

Northfield is an affluent village in Cook County, Illinois, United States. It is located approximately 19 miles (31 km) north of Chicago. As of the 2010 census, the village population was 5,420.
Demographics
As of the census of 2000, there were 5,389 people, 2,155 households, and 1,532 families residing in the village. The population density was 1,822.4 people per square mile (702.9/km²). There were 2,241 housing units at an average density of 757.9 per square mile (292.3/km²). The racial makeup of the village was 92.48% White, 0.52% African American, 0.04% Native American, 5.57%Asian, 0.43% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 1.67% of the population.

There were 2,155 households out of which 31.2% had children under the age of 18 living with them, 62.8% were married couples living together, 6.3% had a female householder with no husband present, and 28.9% were non-families. 26.1% of all households were made up of individuals and 13.5% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.04.

In the village the population was spread out with 25.9% under the age of 18, 3.4% from 18 to 24, 21.9% from 25 to 44, 28.0% from 45 to 64, and 20.9% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 90.8 males. For every 100 females age 18 and over, there were 85.0 males.

The median income for a household in the village was $91,313, and the median income for a family was $114,279. Males had a median income of $85,788 versus $36,567 for females. The per capita income for the village was $63,857. About 1.2% of families and 1.6% of the population were below the poverty line, including 1.2% of those under age 18 and 0.9% of those age 65 or over.