Where Is Area Code 730?
Area code 730 serves southern Illinois, with Alton as its primary city. It is a geographic overlay of area code 618, so both codes cover the same broad calling region rather than separate parts of the state.
Major communities include Belleville, Carbondale, Centralia, Collinsville, Edwardsville, Granite City, Harrisburg, Marion, Mount Vernon, and O'Fallon. The calling region includes parts of Madison, St. Clair, Monroe, Jackson, Jefferson, Marion, Saline, Williamson, and Randolph counties.
The region includes the Mississippi River along Illinois's western edge and the Ohio River near the state's southern tip. It also includes Shawnee National Forest and Cahokia Mounds State Historic Site near Collinsville.
Cities and Communities in the 730 Area Code
- Alton, Madison County
- Anna, Union County
- Belleville, St. Clair County
- Benton, Franklin County
- Cairo, Alexander County
- Carbondale, Jackson County
- Centralia, Clinton, Jefferson, Marion, and Washington counties
- Chester, Randolph County
- Collinsville, Madison and St. Clair counties
- Columbia, Monroe County
- Du Quoin, Perry County
- East St. Louis, St. Clair County
- Edwardsville, Madison County
- Fairview Heights, St. Clair County
- Freeburg, St. Clair County
- Granite City, Madison County
- Harrisburg, Saline County
- Herrin, Williamson County
- Highland, Madison County
- Jerseyville, Jersey County
- Lebanon, St. Clair County
- Marion, Williamson County
- Metropolis, Massac County
- Mount Carmel, Wabash County
- Mount Vernon, Jefferson County
- Murphysboro, Jackson County
- O'Fallon, St. Clair County
- Olney, Richland County
- Red Bud, Randolph County
- Salem, Marion County
- Shiloh, St. Clair County
- Sparta, Randolph County
- Swansea, St. Clair County
- Vienna, Johnson County
- Waterloo, Monroe County
- West Frankfort, Franklin County
History of Area Code 730
Area code 730 entered service on March 7, 2023, as an overlay for area code 618. The change was an overlay rather than a geographic split, so it added telephone number capacity without dividing the existing 618 territory.
Area code 618 was one of the 86 original North American Numbering Plan area codes created in 1947. The 730 overlay added numbering capacity to the long-established southern Illinois calling region, and overlay service requires ten-digit dialing for local calls.
Key Facts About Area Code 730
- Area code 730 is an Illinois geographic area code, and Alton is its primary city.
- Area code 730 is in the Great Lakes region under the listed U.S. Census regional classification.
- Area code 730 is an overlay of area code 618, not the result of a geographic split.
- Area code 730 entered service on March 7, 2023.
- Area code 730 uses Central Time.
- Southern Illinois University Carbondale is located in Carbondale within the area code 730 calling region.
- Southern Illinois University Edwardsville is located in Edwardsville within the area code 730 calling region.
- Cahokia Mounds State Historic Site is located near Collinsville in Madison County within the area code 730 calling region.
Frequently Asked Questions
What state is area code 730 in?
Area code 730 is in Illinois.
What major cities use area code 730?
Major cities in the area code 730 calling region include Alton, Belleville, Carbondale, Collinsville, Edwardsville, Granite City, Harrisburg, Marion, Mount Vernon, and O'Fallon.
What time zone is area code 730 in?
Area code 730 is in Central Time.
Is area code 730 a toll-free number?
No. Area code 730 is a geographic area code, not a toll-free number.