Illinois - Area Code 331

Where is Area Code 331?

Area code (331) is in the state of Illinois

Addison is a town located in DuPage, Cook and Kane Counties, Illinois. A part of the City of Naperville, it is on the northern boundary of Kane County and is on the west coast of the Chicago Metro Area. The population in 2020 was 41,018.


Bartlett is one of the few cities in Cook County which is not included in the census. The town is located on the east side of Addison between the north shore of Lake Michigan and the south side of Lake Michigan. It is on the west bank of the South Platte River. It was once the headquarters for a major airline company.

The area surrounding Addison is an area called the Central Business District. The City of Naperville was established in 1849. Addison is the closest city to Naperville. A short distance away is the City of Barrington.

Barrington is home to the University of Illinois. It is the fifth largest city in DuPage County. Barrington is the only city in the City of DuPage, which is not included in the census or in any of the other municipal directories. Bartlett and Barrington are the only towns in DuPage County, which is not included in the Chicago metropolitan area. Barrington is also the smallest community in DuPage County.

The town of Bartlett is the southern boundary of Naperville and is the center of commerce in the region. The commercial center consists of a grocery store, several restaurants, and two major businesses. The grocery store offers a large selection of groceries as well as a variety of specialty foods. The Naperville Market has a unique combination of an Asian market with a farm-fresh produce market. The restaurants in Bartlett include the legendary Ritz, the New Haven Restaurant and the famous La Pignola, among others.

Barrington, Cook and DuPage Counties have a strong presence in the state government. The most populous community is Barrington. County where the most populated cities are located. The counties have a representative in the state assembly. The City of Barrington is represented by Mayor, Joe Ciaramella. Bartlett and Barrington are both represented by County Clerk, Richard F. O'Neil. The Cook County has a representative in the state senate.

Barrington is the second largest city in DuPage County and is one of the top ten cities in the United States. The city is home to a large military base. The major industries in the area include the Boeing Company, the DuPage County sheriff's office, the U.S. Army and the U.S. Air Force Academy. Barrington is home to many cultural events such as the Barrington Country Club.

The City of Barrington is a major employer. There is a large number of jobs in DuPage County as well as employment in the suburbs. Barrington has been a home to many large corporations.

Cities in Areacode 331

  • Addison
  • North Aurora
  • Bartlett
  • Batavia
  • Bensenville
  • Bloomingdale
  • Bolingbrook
  • Carol Stream
  • Darien
  • Downers Grove
  • Elmhurst
  • Glen Ellyn
  • Glendale Heights
  • Hanover Park
  • Lisle
  • Lombard
  • Naperville
  • Roselle
  • Saint Charles
  • Streamwood
  • Villa Park
  • West Chicago
  • Westmont
  • Wheaton
  • Woodridge

Phone Prefixes in the 331 Areacode

3XX Areacode