The area code which is located exactly in the boundaries of Illinois serves the southern part of Illinois, including most of the Illinois side of the St. Louis metropolitan area (Metro-East). Due to amount of people migrating here, many proposals have been made to include another area code in the southern area of Illinois. But unfortunately all involves either splitting up or overlays of the current area.

The counties and other important places which are located in this region are as follows:
Albion, Alton, Anna, Ashley, Ava, Belleville, Benld, Benton, Breese, Brookport, Cairo, Carbondale, Carlyle, Carmi, Carterville, Centralia, Centreville, Chester, Christopher, Collinsville, Columbia, Creal Springs, Du Quoin, East St. Louis, Edwardsville, Eldorado, Fairfield, Fairview Heights, Flora, Golconda, Grafton, Grand Tower, Granite City, Grayville, Greenville, Harrisburg, Herrin, Highland, Jerseyville, Johnston City, Jonesboro, Kinmundy, Lawrenceville, Lebanon, Madison, Marion, Mascoutah, McLeansboro, Metropolis, Mound City, Mounds, Mount Carmel, Mount Olive, Mount Vernon, Murphysboro, New Athens, Nashville, Nason, O'Fallon, Olney, Orient, Pinckneyville, Red Bud, Robinson, Rosiclare, Salem, Sesser, Shawneetown, Sparta, , St. Elmo, St. Francisville, Staunton, Sumner, Tamms, Trenton, Troy, Vandalia, Venice, Vienna, Wamac, Waterloo, West Frankfort, Wood River and Zeigler.

There are lot of places which are close to this area which can be of real interest for you. The military base is located in this region and you can also get a glimpse of this if you visit this place. The military museums which are there are also very interesting and attract tourists from all over the place every year. The weather is pleasant in this part of the state and that is why you can be rest assured to get a soothing weather at any point of time of the year.

It is important that you know about all these area codes in order to have a better understanding about the telecommunication of this place. Besides do come to 618 areas and I am sure that you will spend some nice time for yourself.