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What is Area Code 312?

April 24th, 2023 | 4 min. read

By Jordan Pioth

Business woman talking on phone

If you own a Chicago business and your area code for your business is 312, you may want to upgrade your business phone system.

Chicago is a competitive market and if you’re conducting business here, it can be difficult to compete without a high-performing phone service.

No one wants to have their business results negatively impacted by a poor-performing phone service.

If your organization is doing business in Chicago, you should utilize a phone provider that helps many Chicago organizations maximize their business results through targeted telephony solutions.

Chicago is one of the largest cities in the world and if your business resides there, it will be hard to compete to stay in business. Additionally, it will be even harder to compete without a reliable phone service.

Coeo has helped thousands of organizations in the Chicagoland area upgrade their phone systems. We want to inform you of the ways that Coeo can help your organization improve its phone service.

By the end of this article, you will know what area code 312 is and how Coeo can improve your phone service.

What is area code 312?

Area code 312 is a historic telephone area code established in 1947 and is the main area code for the city of Chicago. This includes downtown Chicago and the Chicago Loop.

The central business district of Chicago is also covered by the 312 area code.

Neighborhoods such as Lincoln Park and Wicker Park are also covered by this area code and the 312 area code has also expanded to suburbs outside of Chicago such as Oak Forest and Park Forest.

Being that Chicago is the third largest city in the US, Chicago has also used additional area codes such as 773, 872, and 464 because of the growing number of people living in the city.

773 is an area code used for most of the towns and suburban areas around the city of Chicago and the rest of Chicago when the 312 area code is unavailable for use.

However, even with the use of additional area codes, 312 is still the most prominent area code in Chicago and has become more than just a telephone area code.

The 312 has also become a cultural identity for the city and has become one of the most recognized area codes in the country and has been used by numerous organizations as a marketing tool.

If you would like to learn more about area code 312 and how Coeo can help connect your business in the Chicagoland area, check out our 312 landing page

How Coeo helps Chicago organizations with their phone systems

If your organization resides in the competitive Chicago market, it’s important to leverage every business tool possible. And one of those business tools is a high-performing phone service.

Additionally, if your organization is opening a branch office or is moving to Chicago, it’s even more important that your phone system operates effectively on the day you begin operations.

Coeo has delivered quality phone services to thousands of customers in Chicago and the surrounding suburbs.


One way Coeo can help improve your organization’s phone system is by installing a UCaaS solution.

Unified Communications as a Service (UCaaS) is a cloud-based phone system that provides an all-in-one communications package to clients. 

UCaaS integrates multiple communication tools such as voice calling, video conferencing, instant messaging (IM), and content sharing into a single, streamlined service.

With UCaaS being an all-in-one communication collaboration platform, it allows your organization to improve the experience and productivity of its employees.

SIP Trunking

SIP Trunking is another way Coeo can improve your organization’s phone system.

Session Initiation Protocol (SIP) is an application layer protocol that allows you to run your phone system over the internet rather than a traditional phone line.

Trunking serves as the backbone of phone lines used by many users that connect to a telephone network.

SIP Trunking takes your traditional PBX phone system and connects it to the internet using SIP Trunks and SBCs.

This allows your organization to use your current phone system and add a SIP Trunk to transfer your phone system to the cloud making it more scalable, flexible, and reliable. An SBC can also be added to improve security.

When your phone system is transitioned from a PBX phone system to the internet, there may also be security concerns that can arise.

SBCs can help secure your voice network and help you avoid cyberattacks such as toll fraud.

Hosted VoIP

Coeo can also transition your current phone service to a hosted environment.

A hosted VoIP solution incorporates your equipment, servers, and services, and is hosted by a third-party provider. Coeo provides these third-party services to hundreds of Chicago-area companies.

Hosted VoIP allows your organization to save money by using its current phone service.

Hosted VoIP transitions your phone service from a traditional PBX phone system to a cloud-based phone system that uses the internet to make and receive calls with the help of a third-party provider.

Microsoft Teams Direct Routing

Microsoft Teams is one of the most familiar Unified Communications platforms. However, Microsoft Teams is more than just a Unified Communications platform; it can also be used as a phone service.  

Microsoft Teams Direct Routing is a platform similar to hosted VoIP in that it transfers your traditional PBX phone system to the cloud.

This allows your organization to make and receive calls over the internet using the Public Switch Telephone Network (PSTN).

Microsoft Teams Direct Routing takes Microsoft Teams telephony and directly routes it to a third-party provider allowing that provider to manage the service for you.

Next steps to upgrading your phone system using a 312 area code

Now you know what area code 312 is and how Coeo can help your organization upgrade your phone system using a 312 area code.

This will enable you to upgrade your existing phone service or install the right solution if your organization has opened a new office or is moving to Chicago.

No one wants to have a poor-performing phone system. If your organization has moved to or is extending its presence to Chicago, it can be more difficult to succeed in a competitive market with a poor-performing phone service.

Coeo has helped thousands of customers with their phone service and knows how important a good phone service is to an organization.

We want to give you information on how to improve your phone service when you conduct business in the Chicagoland area.

If you would like to speak with our team to talk about different phone solutions that can help your organization or ask any questions you may have you can schedule an appointment.TALK TO AN EXPERT

Now that you understand what area code 312 is and how Coeo can help connect your organization in Chicago, learn more about the 312 area code.

Jordan Pioth

When he's not creating content for Coeo, Jordan loves to watch sports, hang out with friends and family, and anything sneaker-related.