The area code 312 is located in Chicago, Illinois.
Looking for information about the telephone area code 312? Look no further! Area code 312 serves the vibrant city of Chicago, Illinois. Whether you're a local or planning a visit, it's important to have this area code handy. From stunning skyscrapers to delicious deep-dish pizza, Chicago is known for its iconic attractions and rich cultural heritage. So, next time you need to reach someone in the Windy City, just remember to dial that unforgettable 312 area code!