Area code 815
Area code 815 serves Rockford and nearby parts of Illinois, including Joliet, DeKalb and Kankakee. It is on Central Time, which observes daylight saving time. 779 is an overlay for the same area.
Area code 815 at a glance
| State | Illinois (IL) |
| Main city | Rockford |
| Time zone | Central Time |
| UTC offset | UTC−6 in winter, UTC−5 in summer |
| Daylight saving time | Yes |
| Overlay codes | 779 |
Cities in 815
- Rockford
- Joliet
- DeKalb
- Kankakee
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call an 815 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for an 815 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 815 between |
|---|---|
| Eastern | 9:00 AM to 10:00 PM |
| Central | 8:00 AM to 9:00 PM |
| Mountain | 7:00 AM to 8:00 PM |
| Arizona | 6:00 AM to 7:00 PM |
| Pacific | 6:00 AM to 7:00 PM |
See the time in 815 without leaving your CRM
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Other area codes in Illinois
Questions about 815
What time zone is area code 815?
Area code 815 is on Central Time. It observes daylight saving time.
Where is area code 815?
Area code 815 is in Illinois. Its main city is Rockford, and it also covers Joliet, DeKalb and Kankakee.
What are the legal hours to call an 815 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 815?
779 covers the same area as 815, so numbers in the same town can have either code.