Joliet, Illinois

Where Is Area Code 779?

Area code 779 is in northern Illinois. It serves the same region as area code 815 because 779 is an overlay. This calling area covers a large part of northern Illinois outside the Chicago city limits and includes Joliet.

Area code 779 serves cities such as Joliet, Rockford, DeKalb, Freeport, and Moline. It also covers many smaller communities across northern Illinois. Counties in the 815 and 779 service area include Will County, Winnebago County, DeKalb County, and Rock Island County.

Area code 779 covers a region with major transportation routes, river communities, and well-known public institutions. Joliet sits along the Des Plaines River and the Illinois and Michigan Canal corridor. Other notable places in the broader 779 area include the city of Rockford on the Rock River and Northern Illinois University in DeKalb.

History of Area Code 779

Area code 779 was established on March 17, 2007. The Illinois Commerce Commission approved it as an overlay for area code 815. Before 779 began service, area code 815 had served the region since 1947 as one of Illinois's original North American area codes.

Area code 779 did not replace 815. It was added because the 815 region needed more telephone numbers. Because 779 is an overlay, both area codes serve the same geographic area, and 10-digit dialing became necessary for local calls in the region.

Key Facts About Area Code 779

• Area code 779 is a local geographic area code in Illinois.
• Area code 779 overlays area code 815 in northern Illinois.
• Area code 779 officially entered service on March 17, 2007.
• Joliet is one of the major cities in the 779 area code region.
• The 779 area uses the Central Time Zone.
• The 779 and 815 area serves cities including Joliet, Rockford, DeKalb, Freeport, and Moline.
• Northern Illinois University in DeKalb is located within the 779 and 815 calling region.
• The area includes notable waterways and corridors such as the Des Plaines River, the Rock River, and the Illinois and Michigan Canal area.

Frequently Asked Questions

What state is area code 779 in?

Area code 779 is in Illinois.

What major cities use area code 779?

Major cities in area code 779 include Joliet, Rockford, DeKalb, Freeport, and Moline.

Is area code 779 a toll-free number?

No. Area code 779 is a geographic area code.