815 Area Code
Illinois, USA
Local time now · Central Time
2:45 AM
Area code 815 is in Illinois, USA, serving Joliet, Rockford, McHenry and Belvidere. It uses Central Time — the time there now is 2:45 AM. 779 is an overlay for the same area, so local calls need 10-digit dialing. In service since 1947.
| Area code | 815 |
|---|---|
| Location | Illinois, USA |
| Major cities | Joliet, Rockford, McHenry, Belvidere, Crest Hill, Frankfort, Sycamore, Dixon |
| Time zone | Central Time |
| Overlay codes | 779 |
| In service since | 1947 |
Other area codes in Illinois
Time zone converterAll area codes
Frequently asked questions
Where is area code 815?
Illinois, USA — including Joliet, Rockford, McHenry, Belvidere and Crest Hill.
What time zone is area code 815?
Central Time.
How do I call a 815 number from abroad?
Dial your international access code, then 1 (the country code), then 815 and the 7-digit number — for example +1 815 555 0100. From the UK or India dial 00 1 815 …; from Bangladesh 00 1 815 … .
Is a call from 815 a scam?
Not by itself — 815 is an ordinary geographic area code in Illinois. Numbers can be spoofed, so be careful with unexpected calls asking for money or personal details.
Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.