|Area||3.21 sq mi (8 km2)|
|- land||3.21 sq mi (8 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||1,688.5 / sq mi (652 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Postal code||60063, 60093|
|Area code||847 and 224|
|Wikimedia Commons: Northfield, Illinois|
Northfield is an affluent village in Cook County, Illinois, United States. It is located approximately 19 miles (31 km) north of downtown Chicago. It is part of a collection of upscale residential communities north of Chicago that belong to New Trier Township and the greater North Shore. Its zip code, which it shares with neighboring town Winnetka, IL, is the 14th richest zip code in the nation according to Business Week.  As of the 2010 census, the village population was 5,420. 
Northfield is located in Northfield Township, Cook County, Illinois at 42°6'N 87°46'W (42.10,-87.77). According to the 2010 census, the village has a total area of 3.21 square miles (8.3 km2), all land.
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.
Northfield is represented by Republican Robert Dold of Illinois's 10th congressional district in the United States House of Representatives, Republican Mark Kirk and Democrat Dick Durbin in the United States Senate, State Representative Daniel Biss, State Senator Jeffrey Schoenberg and Northfield town President Fred Gougler. However, following the 2011 redistricting, most of Northfield was remapped into the 18th Representative District currently represented by Rep. Robyn Gabel (D.-Evanston). The redistricted map will be used for the 2012 primary and general elections for state legislators taking office in January, 2013.
Northfield is home to New Trier High School's freshman campus.
A small part of Northfield (east of the former Chicago and Northwestern train tracks) is served by Avoca School District 37 in Wilmette. An even smaller part (south of Winnetka Avenue between Sunset Ridge Road and the Forest Preserve) is served by Glenview School District 34 in Glenview.
Christian Heritage Academy is a private school in Northfield that serves students in preschool through twelfth grade.
Northfield is also home to Glenview Montessori School, a fully accredited, non-sectarian school for 2-6 year olds. The Glenview Montessori School is part of the Deerfield Montessori Schools, one of the first Montessori schools established in Illinois.
Saint Louise de Marillac High School was an all-girls Catholic secondary school in Northfield from 1967 to 1994, run by the Daughters of Charity. In 1994, Marillac merged with Loyola Academy. The campus was sold to Christian Heritage Academy.
The local Catholic parish, St. Phillip the Apostle, ran an elementary school which closed in 2004. The facility is currently leased by the Hyde Park Day School, a University of Chicago laboratory school for students with learning disabilities.
Northfield Fire-Rescue Department
The Northfield Fire-Rescue Department, headed by Chief Michael Nystrand, is a combination department. They respond to fire related emergencies, medical emergencies, and specialized rescue situations. Operating out of one station, centrally located at 1800 Winnetka Avenue, is one engine, one ladder truck, one pumper squad, one small squad, one ALS ambulance and a variety of staff cars. The Northfield Fire Rescue Department's Paramedic program is overseen by Saint Francis Hospital in Evanston, as part of Illinois EMS Region X.
Northfield Police Department
The Northfield Police Department, headed by Chief William Lustig, is a combination (full-time/part-time) department which is responsible for all law enforcement operations in Northfield as well as emergency communications (E-911) for the Village. The police department, operated out of one station within the city hall complex, is well known for professionalism and good community relations. This department is Accredited by CALEA, and was one of the first in the State of Illinois to become so accredited.
According to Northfield's 2011 Comprehensive Annual Financial Report, the top employers in the city are:
|Employer||# of Employees|
|2||College of American Pathologists||575|
|4||New Trier High School||209|
|5||Field BMW, Jeep and Volvo||180|
|6||Sunset Ridge Country Club||140|
|7||North Shore Senior Center||130|
|9||Sunset Ridge School District 29||106|
|10||Village of Northfield||105|
Media covering Northfield include Winnetka-Glencoe Patch, Triblocal and 22nd Century Media.
- "Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data (DP-1): Northfield village, Illinois". U.S. Census Bureau, American Factfinder. Retrieved March 15, 2013.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "Legislative District 9". Public Act 97-0006. Illinois General Assembly.
- "2009 Fact Sheet." Kraft Foods. 6/7. Retrieved on January 30, 2011. "Corporate Offices Kraft Foods Inc. Three Lakes Drive Northfield, IL 60093"
- Village of Northfield CAFR