Cook County · Illinois
Chicago, IL area codes and time zone
Quick answer
Chicago is served by area codes 219, 224, 331, 630, 708, 847, keeps CST time (GMT-5), and sits in county FIPS 17031.
- Area codes
- 219 · 224 · 331 · 630 · 708 · 847Within 25 miles of the city centre
- Time zone
- CSTAmerica/Chicago
- UTC offset
- GMT-5CDT in summer
- County FIPS
- 17031Cook County
Dialling from and to Chicago
What this means when you pick up the phone.
Because more than one code covers this area, ten-digit dialling applies for local calls: area code plus number, every time. From abroad, dial +1 then the ten digits.
More on Chicago
Other reference data for this city.