618 area code
Area code 618 is in Illinois. It covers Belleville, O Fallon, Granite City and 371 other places: 331 ZIP codes in Madison, St. Clair, Williamson and 35 other counties. Local time there is , Central Time. In service since 1947; 730 (2023) overlays it, so a number from there can have either code.
- State
- Illinois
- Time zone
- Central
- Largest city
- Belleville
- Overlays
- 730
- In service since
- 1947
- Rate centres
- 242
- Prefixes assigned
- 786 (7,860,000 numbers)
Who calls from a 618 number
NANPA records the carrier each block of 618 numbers is assigned to. Of the 7.1 million 618 numbers assigned, 34% are with cable, internet-calling, business and other carriers (Onvoy); 33% with mobile carriers (AT&T Mobility, Verizon Wireless and T-Mobile); 32% with local phone companies (Frontier and AT&T); 1% with paging companies.
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| AT&T Mobility | Mobile | 15% |
| Onvoy | Cable, VoIP, other | 14% |
| Frontier | Landline | 12% |
| AT&T | Landline | 11% |
| Verizon Wireless | Mobile | 10% |
| T-Mobile | Mobile | 8% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 618
The 215 places with a telephone rate centre of their own using 618, largest first. Each links to its ZIP codes.
Nearby places using 618
These places have no rate centre of their own in NANPA's records; the nearest one uses 618. Near an area-code boundary that can be wrong for part of a town.
- Godfrey
- Fairview Heights
- Swansea
- Shiloh
- Maryville
- Murphysboro
- Pontoon Beach
- Carterville
- East Alton
- Scott Air Force Base
- Mc Leansboro
- Rosewood Heights
- Caseyville
- Scott AFB
- Smithton
- Cottage Hills
- Madison
- Holiday Shores
- McLeansboro
- Fairmont City
- South Roxana
- Jonesboro
- Washington Park
- Crainville
- Venice
- Carrier Mills
- Roxana
- Hartford
- Cambria
- Mitchell
- Central City
- Texico
- Ozark
- Energy
- Fults
- Galatia
- Dorsey
- Harrison
- Wamac
- Brooklyn
- Lovejoy
- North City
- Elsah
- Scheller
- West City
- Grand Chain
- Junction City
- Makanda
- St. Rose
- Golden Eagle
- Damiansville
- Whittington
- Moro
- Valier
- Grand Tower
- Willisville
- Bonnie
- Grantsburg
- Lenzburg
- Orient
ZIP codes in area code 618
331 ZIP codes in 318 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 618 numbers are issued
NANPA's rate centres with the most 618 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
COLLINSVL | Collinsville | 88 |
CARBONDALE | Carbondale | 33 |
BELLEVILLE | Belleville | 31 |
CENTRALIA | Centralia | 24 |
GRANITE CY | Granite City | 22 |
OLNEY | Olney | 16 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
- Madison County (27)
- St. Clair County (30)
- Williamson County (12)
- Jackson County (16)
- Marion County (10)
- Monroe County (8)
- Franklin County (17)
- Jefferson County (13)
- Clinton County (12)
- Jersey County (8)
- Randolph County (12)
- Perry County (6)
- Saline County (6)
- Fayette County (9)
- Crawford County (7)
- Bond County (6)
- Union County (7)
- Richland County (6)
- Lawrence County (4)
- White County (11)
- Wayne County (12)
- Massac County (5)
- Clay County (7)
- Johnson County (8)
- Washington County (10)
- Macoupin County (5)
- Wabash County (5)
- Jasper County (6)
- Hamilton County (4)
- Pope County (5)
- Edwards County (4)
- Alexander County (7)
- Pulaski County (8)
- Gallatin County (5)
- Effingham County (1)
- Calhoun County (7)
- Hardin County (4)
- Shelby County (1)
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 618
Where is area code 618?
Area code 618 is in Illinois. It covers Belleville, O Fallon, Granite City and 371 other places: 331 ZIP codes in Madison, St. Clair, Williamson and 35 other counties.
What ZIP codes are in area code 618?
331 ZIP codes, by the town each is mailed to: Belleville (5, 62220 to 62226), O Fallon (62269), Granite City (62040), Edwardsville (2, 62025 to 62026) and 314 more towns. The full list is on this page.
What time zone is area code 618 in?
Central time.
Is a 618 number a mobile or a landline?
It can be either. 33% of 618 numbers are assigned to mobile carriers and 32% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
What area codes overlay 618?
730. They cover the same area as 618, so a new number there can be given any of them.
Does a 618 number mean the caller is in Illinois?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 618 call can come from anywhere.
Other area codes in Illinois
- 217 Springfield
- 224 Elgin
- 309 Peoria
- 312 Chicago
- 331 Aurora
- 447 Springfield
- 464 Orland Park
- 630 Aurora
- 708 Orland Park
- 730 Belleville
- 773 Chicago
- 779 Rockford
- 815 Rockford
- 847 Elgin
- 861 Peoria
- 872 Chicago
All 17 Illinois area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 618.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/618
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