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# Wisconsin Area Code 920
The 920 area code serves the northeastern region of Wisconsin, encompassing the Door Peninsula and the Fox Valley area. Established in 1997 through a split of the original 414 area code, this region includes major cities such as Green Bay, Appleton, and Oshkosh. The 920 area code covers approximately 5,000 square miles and serves a population of roughly 1.5 million residents. This area is known for its manufacturing heritage, tourism attractions, and cultural institutions, making it an economically significant region within the state.
The 920 area code is part of the North American Numbering Plan (NANP), a coordinated system that manages telephone numbering across North America, including the United States, Canada, and several Caribbean nations. The NANP assigns three-digit area codes to geographic regions, with each area code representing a distinct calling area. These codes are managed by the North American Numbering Plan Administrator (NANPA) and assigned by telecommunications regulatory bodies to ensure efficient call routing and prevent number conflicts. As telecommunications demand grows, established area codes like 920 may eventually require overlay codes or splits to accommodate additional phone numbers, reflecting the system's ongoing evolution to meet modern communication needs.