Area code 224 serves northeastern Illinois and is an overlay for the long-standing 847 area code. It includes a broad swath of Chicago’s northern suburbs, such as Evanston, Schaumburg, Arlington Heights, Waukegan, and Lake Forest. The region is known for its mix of affluent residential communities, major corporate headquarters, and proximity to Lake Michigan. It plays a crucial role in the Chicagoland economy, with businesses ranging from pharmaceuticals and finance to retail and manufacturing. Companies like Walgreens Boots Alliance, Abbott Laboratories, and Allstate Insurance have a strong presence in the area. Cultural institutions, golf courses, and shopping centers also define the region’s upscale appeal. The 224 overlay was introduced in 2002 as demand grew from expanding population and business activity. For professionals, startups, and growing enterprises, a 224 number signifies connection to one of Illinois’ most commercially active and desirable suburban corridors. Whether you're based in a lakefront town or a corporate office park, this area code brings credibility and flexibility in a dynamic regional economy.