Area Code 331

Area code 331 is a North American telephone area code associated with Addison, Bartlett, Batavia, Bensenville, Bloomingdale, Bolingbrook, Carol Stream, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glendale Heights, Hanover Park, Lisle, Lombard, Naperville, North Aurora, Roselle, Saint Charles, Streamwood, Villa Park, West Chicago, Westmont, Wheaton and Woodridge in Illinois, United States. It is part of the North American Numbering Plan, which assigns three-digit codes to geographic areas across the United States, Canada and neighbouring territories.

The dataset lists 25 associated cities for area code 331, each with its own latitude and longitude. These city associations reflect the communities served by the numbering area when the data was compiled.

Area code 331 falls within Illinois. Area codes are assigned geographically, but because of number portability a phone number does not always stay in the region it was originally issued for.

The approximate centre of this numbering area is located at latitude 41.87717 and longitude -88.09482, placing it within Illinois. Coordinates are averaged from the associated city data and should be treated as a general reference point.

Area code 331 is one of hundreds of codes in the North American Numbering Plan. Codes are opened, split and overlaid by numbering administrators as demand changes, so city and region associations can shift over time.

Because of number portability, the current location of a phone number may differ from the area shown here. This page describes the area code assignment, not the physical location of an individual subscriber in United States.