Alton, Illinois

Where Is Area Code 730?

Area code 730 is in southwestern Illinois. It serves the same part of the state as area code 618 because 730 is an overlay of 618. This region covers the Illinois side of the St. Louis metropolitan area and a large section of southern Illinois.

Alton is one of the cities in the 730 area, and other major communities in the same numbering area include Belleville, Carbondale, East St. Louis, Edwardsville, Granite City, and O'Fallon. The area stretches across many counties in southern Illinois, including Madison County and St. Clair County, and it also reaches communities farther south.

This numbering area includes well-known regional features such as the Mississippi River near Alton and East St. Louis. It also covers part of the Metro East region, which sits across the river from St. Louis, Missouri.

History of Area Code 730

Area code 730 was established on July 7, 2023. The North American Numbering Plan Administrator added it as an overlay to area code 618, which had served southern Illinois since 1947.

The overlay did not replace 618. Both area codes now serve the same geographic region, which means new phone numbers in the area may be assigned either 618 or 730. Because of the overlay, 10-digit dialing applies to local calls in the region.

Key Facts About Area Code 730

• Area code 730 is in Illinois and serves Alton along with much of southern Illinois.
• Area code 730 uses the Central Time Zone.
• Area code 730 began service on July 7, 2023.
• Area code 730 is an overlay of area code 618, not a separate split area code.
• Area code 618 was one of the original North American area codes created in 1947, and 730 was added later to expand numbering capacity.
• Area code 730 covers part of the Metro East area near St. Louis, including cities such as Alton, Belleville, East St. Louis, Edwardsville, and Granite City.
• Southern Illinois University Carbondale is within the broader 618 and 730 numbering area.
• The region served by 730 includes major Mississippi River communities in southwestern Illinois.

Frequently Asked Questions

What state is area code 730 in?

Area code 730 is in Illinois.

What major cities use area code 730?

Area code 730 serves Alton, Belleville, Carbondale, East St. Louis, Edwardsville, Granite City, and O'Fallon, among other southern Illinois communities.

Is area code 730 a toll-free number?

No. Area code 730 is a geographic area code.