Area codes are a key part of modern telecommunications, uniquely identifying phone numbers within specific regions. They’re essential for correctly routing calls across the North American Numbering Plan (NANP).
Consider area code 872, for example. It’s one of the area codes serving Chicago, Illinois. Specifically, area code 872 is an “overlay” area code that covers the same geographic region as the 312 and 773 area codes.
This article will give you a comprehensive overview of area code 872, its history, how it was implemented, and why it’s relevant to Chicago and the surrounding areas.