Area Code 618: Coverage, Cities, and Details - area-code -

Frequently Asked Questions

Area code 618 covers many Southern Illinois cities, including Alton, Belleville, Carbondale, Collinsville, Edwardsville, and Granite City. Belleville serves as the primary hub. In total, the 618 area code encompasses 126 municipalities.
With the introduction of the 730 overlay in July 2023, 10-digit dialing is required for all calls within the 618/730 area. This means dialing both the area code and the 7-digit number, regardless of whether it's a local call.
Area code 730 was added as an overlay to 618 in July 2023 to accommodate the growing demand for phone numbers in the region. Both 618 and 730 serve the same geographic area, necessitating 10-digit dialing.
Area code 618 is one of the original North American area codes established back in 1947. It has served Southern Illinois since then, adapting to technological changes and population growth.
Area code 618 covers a significant portion of Southern Illinois, encompassing approximately 15,458 square miles. East Alton, located at approximately 38.88033 latitude and -90.11122 longitude, is one example of a city within its boundaries.
The combined population of the 618/730 area code is estimated to be around 1,288,816 people as of 2023. This population is spread across the various cities and towns within the 15,458 square mile coverage area.
To make a long-distance call to the 618/730 area, you need to dial 1 + the 10-digit number (1 + area code + 7-digit number). This applies to calls originating from outside the 618/730 region.
Dial 0 + the 10-digit number (0 + area code + 7-digit number) for operator assistance within the 618/730 area code region. Remember to include the area code even for local calls due to the overlay.
The North American Numbering Plan Administrator (NANPA) oversees area code 618, as it does for all area codes in the North American Numbering Plan. The NANPA ensures efficient and equitable allocation of phone numbers.
The North American Numbering Plan Administration (NANPA) website (https://www.nanpa.com/) provides detailed information on area code regulations and the North American numbering system.
In Illinois, telecommunications retailers pay Telecommunications Infrastructure Maintenance Fees (TIMFs). However, prepaid calling cards are exempt from TIMFs but subject to standard sales tax.
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