| Official Name: | Northfield Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Cook County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Cook County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Cook |
| Leader Title: | Supervisor |
| Leader Name: | Shiva Mohsenzadeh |
| Established Title: | Established |
| Established Date: | April 2, 1850 |
| Area Total Km2: | 89.72 |
| Area Land Km2: | 88.84 |
| Area Water Km2: | 0.89 |
| Area Water Percent: | 0.99 |
| Population As Of: | 2020 |
| Population Total: | 91565 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Elevation M: | 198 |
| Elevation Ft: | 650 |
| Coordinates: | 42.1072°N -87.8322°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 60015, 60016, 60022, 60025, 60026, 60056, 60062, 60070, 60090, 60091, 60093 |
| Blank Name: | FIPS code |
| Blank Info: | 17-031-53676 |
| Unit Pref: | Imperial |
Northfield Township is one of 29 townships in Cook County, Illinois, USA. As of the 2020 census, its population was 91,565.[1] The township office is located at 2550 Waukegan Road (just south of Willow Road) in Glenview.[2] The township was established on April 2, 1850.[3]
According to the United States Census Bureau, Northfield Township covers an area of ; of this, (99.02 percent) is land and (0.99 percent) is water.
The township does not maintain any cemeteries. Northfield Township contains these seven cemeteries: North Northfield (owned and operated by the Village of Northbrook), Northfield Union, Oak Wood, Sacred Heart, Saint Johns, Saint Marys, and Sunset Memorial Lawns.
As of the 2020 census there were 91,565 people, 33,505 households, and 23,816 families residing in the township. The population density was 2643.79PD/sqmi. There were 37,020 housing units at an average density of 1068.89/sqmi. The racial makeup of the township was 72.16% White, 1.28% African American, 0.26% Native American, 18.04% Asian, 0.02% Pacific Islander, 2.57% from other races, and 5.68% from two or more races. Hispanic or Latino of any race were 6.41% of the population.
There were 33,505 households, out of which 29.50% had children under the age of 18 living with them, 61.34% were married couples living together, 7.32% had a female householder with no spouse present, and 28.92% were non-families. 26.90% of all households were made up of individuals, and 16.90% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.11.
The township's age distribution consisted of 23.1% under the age of 18, 5.1% from 18 to 24, 18.6% from 25 to 44, 28.8% from 45 to 64, and 24.4% who were 65 years of age or older. The median age was 47.3 years. For every 100 females, there were 91.4 males. For every 100 females age 18 and over, there were 90.5 males.
The median income for a household in the township was $113,530, and the median income for a family was $154,234. Males had a median income of $90,531 versus $51,911 for females. The per capita income for the township was $67,606. About 3.9% of families and 6.2% of the population were below the poverty line, including 10.3% of those under age 18 and 4.0% of those age 65 or over.
Allstate has its headquarters in Northfield Township.[5] [6]