ILLINOIS · AREA CODE GUIDE
618 area code location: Belleville and O'Fallon, Illinois
- Local date and time
- Central Time
Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 618 area code map
A printable area code 618 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
618 area code at a glance
- State
- Illinois
- Primary cities
- Belleville, O'Fallon, and Granite City
- Established
- Population
- Largest community: Belleville, 40,237 (2025)Not an area-code population.
- Prefixes in service
- 786 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
New code planned: No, as of 22 September 2026.
- : 730 added as an overlay on 618
Time zone
- Central Time
- Standard time UTC−06:00
- Daylight saving time UTC−05:00
Counties and cities covered
618 numbers are issued across 242 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): Madison County, St. Clair County, Clinton County, Randolph County, Washington County, Franklin County, Marion County, Williamson County, Jefferson County, White County, Clay County, Fayette County, Macoupin County, Calhoun County, Crawford County, Gallatin County, Jackson County, Jersey County, Monroe County, Pulaski County, Richland County, Alexander County, Bond County, Edwards County, Hamilton County, Johnson County, Lawrence County, Saline County, Wayne County, Effingham County, Hardin County, Jasper County, Massac County, Perry County, Union County, Wabash County, Pope County, and Shelby County.
- Belleville
- O'Fallon
- Granite City
- Edwardsville
- Alton
- Collinsville
- Carbondale
- Marion
- Mount Vernon
- Glen Carbon
- Herrin
- Troy
- Centralia
- Waterloo
- Columbia
- Wood River
- Highland
- Mascoutah
- Bethalto
- Jerseyville
- Olney
- Harrisburg
- Greenville
- Robinson
- Vandalia
217 more communities
- West Frankfort
- Salem
- Murphysboro
- Chester
- Mount Carmel
- Benton
- Carterville
- Metropolis
- Du Quoin
- Staunton
- Pinckneyville
- Lebanon
- Fairfield
- Flora
- Carmi
- Breese
- Freeburg
- Lawrenceville
- Anna
- Sparta
- Millstadt
- Dupo
- Red Bud
- Eldorado
- New Baden
- Johnston City
- Carlyle
- Nashville
- Newton
- Trenton
- Christopher
- McLeansboro
- Aviston
- Altamont
- Brighton
- Sesser
- Steeleville
- New Athens
- Albion
- Marissa
- Sumner
- Bridgeport
- Ina
- Carrier Mills
- Bunker Hill
- Cairo
- Grayville
- Zeigler
- De Soto
- Germantown
- Saint Jacob
- Oblong
- Vienna
- Okawville
- Saint Elmo
- Palestine
- Valmeyer
- Sandoval
- Albers
- Louisville
- Norris City
- Worden
- Goreville
- Royalton
- Cobden
- Wayne City
- Shawneetown
- Rosiclare
- Marine
- Hamel
- Beckemeyer
- Percy
- Odin
- Ramsey
- Elkville
- Coulterville
- Clay City
- Ridgway
- Hardin
- Grafton
- Enfield
- Hurst
- Livingston
- Tilden
- West Salem
- Kinmundy
- Brookport
- Brownstown
- Pocahontas
- Bartelso
- Dongola
- Golconda
- Alhambra
- Cisne
- Woodlawn
- Noble
- Bluford
- Crossville
- Mounds
- Saint Libory
- Blair
- Irvington
- Pittsburg
- Sefton
- Ava
- Evansville
- Farina
- Tamaroa
- Saint Francisville
- Prairie du Rocher
- Patoka
- Shipman
- Hoyleton
- Equality
- Mulberry Grove
- Dahlgren
- Creal Springs
- Iuka
- Mound City
- Thompsonville
- Hutsonville
- Ullin
- Dix
- Ashley
- Allendale
- Hoffman
- Beecher City
- Hecker
- Waltonville
- Keyesport
- Karnak
- Edgewood
- New Haven
- Tamms
- Medora
- Xenia
- Herrick
- Summerfield
- Grantfork
- Joppa
- Ellis Grove
- Flat Rock
- Saint Peter
- Baldwin
- Belle Rive
- Ewing
- Kampsville
- Bible Grove
- Fayetteville
- Addieville
- Bellmont
- Elizabethtown
- McClure
- Cave In Rock
- Stonefort
- Cypress
- Omaha
- Oakdale
- Parkersburg
- Thebes
- Broughton
- Du Bois
- Kell
- Willow Hill
- Batchtown
- New Minden
- Fieldon
- Claremont
- Calhoun
- Hettick
- Browns
- Dorchester
- Venedy
- Brussels
- Eddyville
- Mount Erie
- Hamburg
- Maunie
- Sailor Springs
- Rose Hill
- Simpson
- Burnt Prairie
- Macedonia
- Kaskaskia
- Annapolis
- Belle Prairie
- Birds
- Blairsville
- Chauncey
- Chesterfield Rockbridge
- Crisp
- Dale
- Dow
- Dundas
- East Saint Louis
- Edgemont
- Geff
- Glenn
- Hardinville
- Harmony
- Hicks
- Leamington
- Olive Branch
- Orchardville
- Paulton
- Prairietown
- Raleigh Galatia
- Renault
- Renshaw
- Rice
- Shattuc
- Shobonier
- Villa Ridge
- Wendelin
- Westport
- Westview
- Woodburn
Notable places in 618
| Place | Where | What it is |
|---|---|---|
| Scott Air Force Base | 4.3 km from Mascoutah | US Air Force installation |
| Southern Illinois University Carbondale | 0.7 km from Carbondale | University, 12,745 12-month enrollment (2023–24) |
| Southern Illinois Airport | 4.7 km from De Soto | Airport |
| MidAmerica St. Louis Airport | 4.3 km from Mascoutah | Airport |
| Southern Illinois University Edwardsville | 0.8 km from Edwardsville | University, 14,122 12-month enrollment (2023–24) |
| St. Louis Downtown Airport | 6.0 km from East Saint Louis | Airport |
| Greenville University | 1.6 km from Greenville | University, 1,338 12-month enrollment (2023–24) |
| Fort de Chartres | 5.3 km from Prairie du Rocher | Fortification |
| Ralph Korte Stadium | 2.2 km from Edwardsville | Stadium |
| Charter Oak Schoolhouse | 7.9 km from Sparta | Museum |
Area code 618
618 started service on .
No new code is planned for the region as of .
Area code 730 has its own page.
Questions about 618
Where is the 618 area code?
618 is in Illinois. Its numbers are issued in Belleville, O'Fallon, Granite City, and 239 other communities.
What time zone is area code 618 in?
618 is in Central Time. Daylight saving time is observed.
Does 618 have an overlay?
Yes. 730 was added as an overlay on 618 on 7 July 2023.
What cities are in the 618 area code?
Belleville, O'Fallon, Granite City, Edwardsville, and Alton, and 237 other communities.
What state is area code 618 in?
Area code 618 is in Illinois.
What counties are covered by area code 618?
Area code 618 covers communities in Madison County, St. Clair County, Clinton County, Randolph County, Washington County, Franklin County, Marion County, Williamson County, Jefferson County, White County, Clay County, Fayette County, Macoupin County, Calhoun County, Crawford County, Gallatin County, Jackson County, Jersey County, Monroe County, Pulaski County, Richland County, Alexander County, Bond County, Edwards County, Hamilton County, Johnson County, Lawrence County, Saline County, Wayne County, Effingham County, Hardin County, Jasper County, Massac County, Perry County, Union County, Wabash County, Pope County, and Shelby County.
Is 618 a toll-free area code?
No. 618 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 618, answered by an AI agent
A local number for Belleville, O'Fallon, and Granite City, Illinois, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.