Area Code Lookup
What Area Code Is Joliet?
2 area codes serve Joliet · Illinois
Joliet is served by area codes 779, 815. It is located in Illinois.
Area Codes Serving Joliet
Frequently Asked Questions
What area code is Joliet?
Joliet is served by area codes 779, 815. It is located in Illinois.
Why does Joliet have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Joliet now has 2 area codes — 779 and 815 — covering the same or overlapping areas.
How do I call Joliet from outside the US?
To call Joliet from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-779-XXX-XXXX). The +1 is the country code for all NANPA countries.