773 Area Code — Chicago, IL
Area code 773 serves Chicago in Illinois. Local time follows America/Chicago. It overlays with 312, 872, so 10-digit dialling is required.
- State
- Illinois
- Primary city
- Chicago
- Timezone
- America/Chicago
- In service since
- 1996
- Type
- Geographic
Cities Served by 773
The 773 area code covers 1 city in Illinois.
- Chicago
About Area Code 773
Area code 773 is a North American Numbering Plan (NANP) area code that has been in service since 1996. It is administered by NANPA on behalf of the FCC and serves the Illinois region anchored on Chicago.
773 now shares its territory with overlay codes (312, 872). 10-digit dialling is required for local calls within this region because the same 7-digit number can be assigned under either code.
Mobile numbers in 773 are portable: a person who moved away from Chicago may still carry a 773 mobile number on their device. If you receive an unexpected call from a 773 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Illinois, you may also interact with neighbouring or overlay codes (312, 872). See the related codes section below to explore the rest of Illinois.
Other Illinois Area Codes
Continue exploring the Illinois numbering plan.
773 Area Code FAQ
Where is area code 773?
Area code 773 is located in Illinois, primarily serving Chicago. The region operates on CT (America/Chicago) time.
What state is 773 area code?
773 is a Illinois area code. It was put into service in 1996 and shares its geographic footprint with overlay codes 312, 872.
Is 773 a scam area code?
773 is a legitimate North American area code allocated by NANPA to Illinois. Like any geographic area code, scammers sometimes spoof 773 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 773 use?
Area code 773 operates on CT (America/Chicago). Numbers in this area code follow standard Illinois time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 773 phone number?
Yes. Use the reverse lookup widget above to enter a full 773 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.
What's the difference between 773 and 312?
773 and 312 cover the same Illinois geographic area as overlay codes. Calls between them are local, but you must dial all 10 digits. New phone numbers in this region are assigned from either pool depending on what's available with the carrier at signup.