815 area code
Area code 815 is in Illinois, including Rockford, Crystal Lake, Plainfield and Joliet. It's on Central Time.
Central Time
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Business hours are taken as 9 AM to 5 PM on weekdays. US telemarketing rules only allow sales calls between 8 AM and 9 PM local time.
Cities in area code 815
| City | Time zone |
|---|---|
| Rockford, IL | Central Time |
| Crystal Lake, IL | Central Time |
| Plainfield, IL | Central Time |
| Joliet, IL | Central Time |
| McHenry, IL | Central Time |
| DeKalb, IL | Central Time |
| Woodstock, IL | Central Time |
| Freeport, IL | Central Time |
| Lockport, IL | Central Time |
| Peru, IL | Central Time |
| Dixon, IL | Central Time |
| Romeoville, IL | Central Time |
Other area codes in Illinois
More: look up another area code · time zone converter · US time zones map
Questions people ask
Where is area code 815?
Area code 815 is in Illinois, including Rockford, Crystal Lake, Plainfield and Joliet.
What time zone is area code 815?
815 is on Central Time (UTC−6, UTC−5 in summer).
What time is it in area code 815 right now?
The live clock at the top of this page shows the current local time in area code 815.