Area code 779 is an overlay for 815, serving northern Illinois outside of the Chicago metro area, including cities like Rockford, Joliet, DeKalb, and Ottawa. Introduced in 2007, this area code reflects growing demand in a region rich in manufacturing, agriculture, and suburban expansion. Rockford, the largest city in the region, is known for aerospace, healthcare, and logistics industries, while DeKalb is home to Northern Illinois University, contributing to education and research activity. The area offers a balance of small-town charm and access to major markets via road and rail. With proximity to both Chicago and rural Illinois, 779 is ideal for companies looking for regional reach without big-city overhead. A 779 number gives your contact a presence in one of the Midwest’s most economically diverse corridors.