Caller ID for
Area code 618
Area code 618 Collinsville, Illinois
Area code 618 is one of the original 1947 area codes, in Illinois, with numbers assigned in Collinsville, Carbondale, Belleville and 212 more places. It’s 11:11 PM there now.
- State
- Illinois17 area codes in Illinois
- Time zone
- Central11:11 PM there now
- Exchanges
- 786215 places
- Overlay
- 730Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 618 is
Numbers in 618 are assigned to 215 places in 43 counties: Madison County, St. Clair County, Williamson County, Jefferson County, Clinton County, Washington County, plus 37 more.
No single place dominates: Collinsville, the largest, has 11% of the exchanges.
- Collinsville88
- Carbondale33
- Belleville31
- Centralia24
- Granite City22
- Olney16
- Alton15
- Marion15
- Mount Vernon14
- East St. Louis14
- Herrin12
- Wood River11
- Edwardsville11
- Benton9
- O'Fallon9
- Harrisburg9
- Metropolis8
- Robinson7
- Jerseyville7
- Anna6
- Glen Carbon5
- Mount Carmel5
- Vandalia5
- Cairo5
Phone companies in 618
786 blocks of numbers in 618 are held by 49 phone companies. The most belong to Frontier (170), AT&T (113) and AT&T Mobility (98).
A mix: about 27% wireless, 47% local phone and cable and 26% other carriers, including internet phone services.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
618 has been in service since 1947, when the first North American area codes were set up.
730 (since 2023) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
82 new exchanges were assigned since 2021, the latest in June 2025.
Calling 618
It’s 11:11 PM Central time in 618 right now.
From elsewhere in the U.S., dial 1, 618 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
Illinois has 17 area codes: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.
- 557 · St. Louis, MO · about 55 mi
- 314 · St. Louis, MO · about 55 mi
- 636 · St. Charles, MO · about 73 mi
- 217 · Springfield, IL · about 95 mi
- 447 · Danville, IL · about 102 mi
- 573 · Columbia, MO · about 103 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 618 area code
Map of the 618 area code around Collinsville, Carbondale and Belleville, Illinois.
Cities on the map
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Questions about 618
Where is area code 618?
In Illinois, covering Collinsville, Carbondale and Belleville and other places across 43 counties.
What time zone is 618 in?
Central time. It was 11:11 PM there when this page loaded.
Is 618 an overlay?
Yes. 730 serves the same area, so dial all 10 digits for local calls.
Which phone companies have 618 numbers?
49 companies hold blocks; the most belong to Frontier, AT&T and AT&T Mobility. About 27% of blocks are wireless.
Is 618 running out of numbers?
Not on record. 82 new exchanges have been assigned since 2021.