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Area codes / Illinois

Illinois area codes

Illinois has 17 area codes in service, in the Central time zone. Pick one for a local business number your Illinois customers recognize.

Every Illinois area code

Area codeTime zoneOverlaid withIn service since
217 Central 447 1947
224 Central 847 2002
309 Central 861 1957
312 Central 872 1947
331 Central 630 2007
447 Central 217 2021
464 Central 708 2022
618 Central 730 1947
630 Central 331 1996
708 Central 464 1989
730 Central 618 2023
773 Central 872 1996
779 Central 815 2007
815 Central 779 1947
847 Central 224 1996
861 Central 309 2023
872 Central 312, 773 2009

Picking a Illinois area code

217, 312, 618, and 815 are among the original area codes created in 1947. 17 Illinois area codes share their region with an overlay, so a new number there may come in either code; both ring the same area, and calls within it are dialed with all ten digits.

Already have a Illinois number customers know? Move it to Onyx Phone for free, and keep answering while it moves.

Getting started

  1. Create a login and pick a plan. Checkout saves a card for the 7-day free trial, and nothing is charged until it ends.
  2. Confirm your business and its 911 address, and get a local number on the spot. Bringing your own number? You answer on a temporary one while it moves over, for free.
  3. Choose where calls ring, write what callers hear, invite your team, and register for texting. Then answer in the browser, the iPhone and Android apps, or a desk phone. How it works has the details.

Included on every plan

Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.

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Area code data from NANPA, file of October 24, 2026.