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Area code 224 serves parts of northeastern Illinois, primarily covering suburbs northwest of Chicago, including areas like Arlington Heights, Palatine, and Schaumburg. Introduced in 2002 as an overlay to the existing area code 847, 224 was established to accommodate the region's growing population and increasing demand for telephone numbers.

This area code operates within the North American Numbering Plan (NANP) and follows the typical 10-digit dialing format of local calls, combining the area code with a seven-digit telephone number. The overlay nature of area code 224 means residents and businesses share the same geographic area code, requiring 10-digit dialing for all calls within its service area.

The introduction of 224 allowed for more telephone numbers to be issued, reflecting the expanding telecommunications needs of the region. The area code encompasses various sectors, from residential neighborhoods to bustling commercial districts, contributing to its diverse telecommunications landscape.

Notably, area code 224 features the same geographic boundaries as area code 847, but it helps distribute new numbers to accommodate the influx of communication devices and services. As a relatively newer area code, 224 has thus far maintained a modern telecommunications infrastructure, supporting landline, mobile, and VoIP services effectively. Overall, area code 224 plays a vital role in the telecommunications framework of northeastern Illinois, reflecting the region's growth and technological advancements.