Jan 1, 2026 · 331 Area Code located in Illinois, including 33 cities, 5 counties, 1 time zone, map, Census demographics, and 203 active prefixes.

Area codes 630 and 331 are telephone area codes in the North American Numbering Plan (NANP) for portions of Chicago 's near and far western suburbs, including the majority of DuPage County, Illinois.

Area code 331 is located in Illinois. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

Jul 11, 2011 · Find 331 area code details including city, time zone, and map. Lookup area code 331 phone number, name, and location.

6 days ago · 331 is an area code located in the state of Illinois, US. The largest city it serves is Aurora. Find out where 331 area code zone from, which states, counties and cities it covers. Get the most …

Browse area code 331 phone numbers, prefixes and exchanges. The 331 area code serves Chicago, Hickory Hills, Elgin, Arlington Heights, West Chicago, covering 17 ZIP codes in 4 counties.

About area code 331: location, common spam callers, related area codes, and more. Includes 331 reverse phone lookup to identify spam callers.

Area Code 331 is one of the 269 three-digit telephone area codes in the USA. It covers roughly 2,099,963 unique phone numbers and 481,890 individuals near the cities of Aurora, Naperville, and …

Area code 331 covers a significant portion of the western suburbs of Chicago, Illinois. This includes areas within DuPage, Cook, Kane, and Will counties, as well as a small portion of Kendall County.

Area Code 331 is one of the most popular area codes in the United States. It covers a large area of the Midwest, including Illinois, Wisconsin, and parts of Iowa and Indiana.