The Mystery Unveiled: All You Need to Know about the 312 Area Code in Chicago, USA


If you live in Chicago, USA, or plan to visit soon, you may have heard about the 312 area code. This area code has been in use since 1947 and covers the downtown area of Chicago, including the Loop and the West Loop neighborhoods. In this article, we will unveil the mystery behind the 312 area code, including its location, history, and other interesting facts.

The Location of the 312 Area Code

The 312 area code is located in the state of Illinois, USA. It covers the central area of Chicago, including the Loop and West Loop neighborhoods, as well as parts of the Near North Side and Near South Side neighborhoods. The 312 area code is one of the original area codes created by the North American Numbering Plan (NANP), which was established in 1947 to simplify the way telephone numbers were assigned and dialed.

The Coverage Area of the 312 Area Code

The 312 area code covers an area of approximately 10 square miles in Chicago. It is bordered by area codes 773 to the north and west, and 872 to the south. The 312 area code is also known as an overlay area code because it shares its coverage area with other area codes, such as 773 and 872.

The History of the 312 Area Code

The 312 area code was one of the original area codes established in 1947 by the NANP. At the time, it covered the entire state of Illinois. However, as the population grew and demand for telephone numbers increased, new area codes were created to serve different regions of the state. Today, the 312 area code covers only the downtown area of Chicago.

Interesting Facts about the 312 Area Code

  • The 312 area code was the only area code serving Chicago until 1989 when area code 708 was introduced.
  • The 312 area code was split in 1996 when area code 773 was introduced to serve the north and west sides of Chicago.
  • In 2009, area code 872 was introduced as an overlay of the 312 area code to provide additional telephone numbers to the area.
  • The 312 area code is often associated with the city of Chicago and is frequently used in popular culture, such as in movies and TV shows.

How IPPBX can help?

If you’re looking for an easy way to get a 312 area code number for your business, look no further than With their virtual phone service, you can quickly and easily obtain a local phone number with the 312 area code. Having a local touch can be extremely beneficial for businesses, as it can help establish trust and credibility with potential customers in the Chicago area. By using a 312 area code, you’ll show that you understand the local market and are committed to serving the needs of customers in the area. Plus, with, you’ll get all the benefits of a modern, cloud-based phone system, including advanced features like call routing, voicemail-to-email, and more.


In conclusion, the 312 area code is an important part of the telephone system in Chicago, USA. It covers the downtown area of the city and has been in use since 1947. Over the years, it has been split and overlaid with other area codes to meet the increasing demand for telephone numbers. We hope this article has provided you with all the information you need to know about the 312 area code in Chicago. If you have any questions or comments, please feel free to leave them below.

Additional Resources: To learn more about the 312 area code, you can visit the official website of the Illinois Commerce Commission, which regulates telecommunications in the state.

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