The area code 815 is located in Joliet, Illinois.
The 815 area code is the telephone area code for Joliet, Illinois. Located in the heart of the Prairie State, Joliet is a vibrant city with a rich history and a thriving community. If you're looking to connect with friends, family, or local businesses in Joliet, knowing the 815 area code is essential. From exploring the scenic beauty of the Des Plaines River to enjoying the lively downtown scene, Joliet offers something for everyone. Whether you're planning a visit or just want to stay connected, don't forget the 815 area code.