Area code 312
Area code 312 serves Chicago, Illinois. It is on Central Time, which observes daylight saving time. 872 is an overlay for the same area.
Area code 312 at a glance
| State | Illinois (IL) |
| Main city | Chicago |
| Time zone | Central Time |
| UTC offset | UTC−6 in winter, UTC−5 in summer |
| Daylight saving time | Yes |
| Overlay codes | 872 |
Cities in 312
- Chicago
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 a 312 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 a 312 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 312 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 312 without leaving your CRM
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Other area codes in Illinois
Questions about 312
What time zone is area code 312?
Area code 312 is on Central Time. It observes daylight saving time.
Where is area code 312?
Area code 312 is in Illinois. Its main city is Chicago.
What are the legal hours to call a 312 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 312?
872 covers the same area as 312, so numbers in the same town can have either code.