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  5. Area Code 618

Where Is Area Code 618?

Area code 618 is found in the US state of Illinois. Primarily servicing the city of Belleville (population: 95241), area code 618 covers 40 counties of Illinois.

Located in the Central time zone, area code 618 is on the same time as Chicago, IL.

Area code 618 was brought into effect on January 1, 1947.

Map of Illinois with area code 618 highlighted
Location of Area Code 618 and surrounding states.

Counties in Area Code 618

  • Alexander,
  • Bond,
  • Calhoun,
  • Clay,
  • Clinton,
  • Crawford,
  • Edwards,
  • Effingham,
  • Fayette,
  • Franklin,
  • Gallatin,
  • Hamilton,
  • Hardin,
  • Jackson,
  • Jasper,
  • Jefferson,
  • Jersey,
  • Johnson,
  • Lawrence,
  • Macoupin,
  • Madison,
  • Marion,
  • Massac,
  • Monroe,
  • Perry,
  • Pope,
  • Pulaski,
  • Randolph,
  • Richland,
  • Saint Clair,
  • Saline,
  • Shelby,
  • Union,
  • Wabash,
  • Washington,
  • Wayne,
  • White,
  • Williamson.

Most Populous Cities in Area Code 618

City County City Population Time Zone
Belleville Saint Clair 95,241 CST
East Saint Louis Saint Clair 58,042 CST
Granite City Madison 43,507 CST
Carbondale Jackson 34,603 CST
Edwardsville Madison 33,572 CST
Collinsville Madison 33,259 CST
Alton Madison 32,532 CST
O Fallon Saint Clair 31,208 CST
Marion Williamson 27,076 CST
Mount Vernon Jefferson 24,041 CST
Centralia Marion 22,239 CST
Fairview Heights Saint Clair 17,298 CST
Waterloo Monroe 16,800 CST
Godfrey Madison 16,402 CST
Highland Madison 15,891 CST
Murphysboro Jackson 15,568 CST
Troy Madison 14,292 CST
Glen Carbon Madison 13,747 CST
Harrisburg Saline 12,943 CST
Herrin Williamson 12,926 CST
Jerseyville Jersey 12,864 CST
Columbia Monroe 12,705 CST
West Frankfort Franklin 12,583 CST
Olney Richland 12,175 CST
Metropolis Massac 11,456 CST

Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.

View all United States Area Codes.

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This page was last updated on July 3, 2015.