Area Code 815: Rockford, Illinois
815 is a telephone area code serving Illinois, including Rockford, Joliet. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 815 are located in Illinois, United States (NANP region: North). The code covers Rockford, Joliet.
How to Dial Area Code 815
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 815 XXX-XXXX (10-digit dialing: 815 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 815 XXX XXXX |
| From Australia | 0011 1 815 XXX XXXX |
| From a mobile phone anywhere | +1 815 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 815 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 815
Calls to a 815 number ring in the America/Chicago time zone, standard offset UTC-06:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Cities and Communities Served by 815
The following places fall inside the 815 calling area:
Other Area Codes in Illinois
These codes also serve Illinois. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 217 | Springfield, Champaign |
| 224 | Chicago North Suburbs (overlay) |
| 309 | Peoria, Moline |
| 312 | Chicago (downtown) |
| 331 | Chicago West Suburbs (overlay) |
| 464 | Chicago South Suburbs (overlay for 708) |
| 618 | East St. Louis, Carbondale |
| 630 | Chicago West Suburbs |
| 708 | Chicago South Suburbs |
| 730 | Southern Illinois (overlay for 618) |
| 773 | Chicago (outer) |
| 847 | Chicago North Suburbs |
| 872 | Chicago (overlay) |
See all 14 area codes in Illinois →
Frequently Asked Questions
Where is area code 815?
Area code 815 is in Illinois, United States. It covers Rockford, Joliet.
What time zone is area code 815 in?
Area code 815 rings in the America/Chicago time zone (UTC-06:00 standard).
Do I need to dial 1 before area code 815?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 815, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 815.
Is area code 815 toll-free?
No. 815 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.