773 Area Code: Chicago, Illinois
From the North American Numbering Plan Administrator (NANPA), checked October 13, 2026.
773 is a Chicago, Illinois area code that also serves O’Hare and Midway airports. It shares its area with 872.
Local 773 numbers available
None found
Twilio's number search found no local 773 numbers that can take calls, checked October 15, 2026. CallFlux buys its tracking numbers through Twilio. We run this search at most once a day, and one search lists at most 30 numbers. Numbers come and go, so a search in the CallFlux dashboard shows what is available at that moment.
773 area code at a glance
Places the 773 area code covers
“The 312 NPA and 773 NPA serve the City of Chicago; the 773 NPA also serves O’Hare International Airport and Midway International Airport.”
NANPA's map of 773 is in Planning Letter PL-392 (PDF).[13]
Rate centers NANPA lists for 773
NANPA's rate center report lists 10 rate centers for 773, as of October 13, 2026.[15]
- Chicago Zone 02
- Chicago Zone 03
- Chicago Zone 04
- Chicago Zone 05
- Chicago Zone 06
- Chicago Zone 07
- Chicago Zone 08
- Chicago Zone 09
- Chicago Zone 10
- Chicago Zone 11
Area codes that share the 773 area
In an overlay, more than one area code serves the same area. NANPA lists 773 in the 773/872 overlay. So 872 serves the same area as 773.[3]
“The new 872 NPA will serve the same geographic area currently served by the existing 312 and 773 NPAs.”
Get a local 773 tracking number
CallFlux tracking numbers are picked by area code. In the CallFlux dashboard you type 773, search the numbers available in it and choose one. Calls to that number forward to the phone you set, and you can record them, assign the number to a campaign and swap it onto your website, so each call shows which ad or page it came from.
A local tracking number is $1.15 a month, on top of a CallFlux plan.
Frequently asked questions
Where is the 773 area code?
773 is a Chicago, Illinois area code that also serves O’Hare and Midway airports. It shares its area with 872.
What area codes share the 773 area?
NANPA lists 773 in the 773/872 overlay. So 872 serves the same area as 773.
What time zone is the 773 area code in?
NANPA lists Central as the predominant time zone for 773.
How do you dial a local call in the 773 area code?
NANPA lists 1 + 10 digits as the predominant way to dial both local and toll calls within 773.
When did the 773 area code start?
NANPA lists October 12, 1996 as the date 773 was placed in service.
Can I get a local 773 phone number for my business?
Our latest search, on October 15, 2026, found no local 773 numbers. Numbers come and go, so search 773 again in the CallFlux dashboard. A local tracking number is $1.15 a month, on top of a CallFlux plan.
Sources
Every fact on this page, the words it rests on and the date it was checked. NANPA writes NPA for an area code.
[1] NANPA lists 773 as an area code in Illinois.
“LOCATION: IL”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[2] NANPA lists October 12, 1996 as the date 773 was placed in service.
“IN_SERVICE_DT: 12-Oct-1996”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[3] NANPA lists 773 as part of the 773/872 overlay.
“OVERLAY_COMPLEX: 773/872”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[4] NANPA lists 312 as the parent area code of 773.
“PARENT_NPA_ID: 312”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[5] NANPA lists Central as the predominant time zone of 773.
“TIME_ZONE: C”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[6] NANPA's TIME_ZONE field gives a code's predominant time zone or zones.
“Predominant time zone(s) for NPA”
NANPA NPA Database field definitions · checked October 13, 2026
[7] In NANPA's field definitions, C stands for Central.
“C-Central”
NANPA NPA Database field definitions · checked October 13, 2026
[8] NANPA lists 1 + 10 digits as the predominant way to dial a local call within 773.
“HOME_NPA_LOCAL_CALLS: 1+10D”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[9] NANPA's HOME_NPA_LOCAL_CALLS field gives the predominant dialing pattern for local calls.
“Predominant dialing pattern on Home NPA Local Calls”
NANPA NPA Database field definitions · checked October 13, 2026
[10] NANPA lists 1 + 10 digits as the predominant way to dial a toll call within 773.
“HOME_NPA_TOLL_CALLS: 1+10D”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[11] NANPA's HOME_NPA_TOLL_CALLS field gives the predominant dialing pattern for toll calls.
“Predominant dialing pattern on Home NPA Toll Calls”
NANPA NPA Database field definitions · checked October 13, 2026
[12] In NANPA's field definitions, 1+10D stands for 1 + 10 digits.
“1+10D - one plus ten digits”
NANPA NPA Database field definitions · checked October 13, 2026
[13] NANPA's database points to Planning Letter PL-392 for a map of 773.
“MAP: 392”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[14] NANPA's rate center report puts all 10 of 773's rate centers in the Chicago-Naperville-Elgin, IL-IN Metropolitan Statistical Area.
“Chicago-Naperville-Elgin, IL-IN Metropolitan Statistical Area”
NANPA NPA Rate Center Report (created October 13, 2026) · data · checked October 13, 2026
[15] NANPA's rate center report lists 10 rate centers for 773.
“CHICAGO ZONE 02; CHICAGO ZONE 03; CHICAGO ZONE 04; CHICAGO ZONE 05; CHICAGO ZONE 06; CHICAGO ZONE 07; CHICAGO ZONE 08; CHICAGO ZONE 09”
NANPA NPA Rate Center Report (created October 13, 2026) · data · checked October 13, 2026
[16] NANPA describes 312 and 773 as the City of Chicago, with 773 also serving both airports.
“The 312 NPA and 773 NPA serve the City of Chicago; the 773 NPA also serves O’Hare International Airport and Midway International Airport.”
NANPA Planning Letter PL-392 (August 10, 2009) · checked October 13, 2026
[17] 872 serves the same area as 312 and 773.
“The new 872 NPA will serve the same geographic area currently served by the existing 312 and 773 NPAs.”
NANPA Planning Letter PL-392 (August 10, 2009) · checked October 13, 2026
[18] NANPA's glossary uses NPA, Numbering Plan Area, for an area code.
“Numbering Plan Area (Area Code)”
NANPA glossary · checked October 13, 2026