Geographic area code
773 area code
Assigned to Illinois. An area code does not identify a caller's exact city, address, or current location.
Area code facts
Same or related numbering region
Overlay codes
Overlay peers can serve the same geography. They are shown with equal weight, not as secondary alternatives.
Approximate map
Approximate orientation near Chicago; the marker is not an exact area-code boundary.
773 orientation · Chicago, IL
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Why is the map approximate?
Telephone area codes are assigned through exchanges and overlay complexes, not as a single official street-level polygon. This map centers a known city associated with the code when available; otherwise it uses the jurisdiction center. It must not be used to locate a specific caller or phone.
Interpret the result
What 773 tells you—and what it cannot
- FACT
Numbering-plan assignment
773 is assigned to Illinois under the NANP snapshot.
- CONTEXT
Overlays and time zone
Its listed overlay peers are 872. Time-zone labels describe the service region, not a caller's current clock.
- LIMIT
Not a reverse-phone lookup
The code alone cannot identify a subscriber, prove a caller's identity, or show where a mobile phone is now.
Source: North American Numbering Plan Administrator (NANPA) NPA report · file date 08/04/2026 · status and relief fields are descriptive, not a promise of future availability.
City orientation
Commonly associated city
A city can have several codes and a code can cover communities beyond the city.
Same jurisdiction
Other Illinois area codes
Look up another area code
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NANPA snapshot
08/04/2026