Area codes are an essential part of the phone system. They help route calls to the right place. Each area code corresponds to a specific geographic region.
The 312 area code is the primary area code for downtown Chicago. It’s also one of the original area codes, established in 1947.
This article provides a comprehensive overview of the 312 area code. We’ll explore its history, pinpoint exactly where the 312 area code is located, and discuss how it’s used today.