Area code 773 – Illinois
773 has served Illinois since 1996, split from 312. All but a handful of its 786 number blocks are allocated (786 of 786), so it is effectively exhausted. AT&T is the largest holder with 46.3% of blocks, ahead of T-Mobile at 21.5%. It shares its geography with overlay codes 872, so local calls take all ten digits. 667 FTC complaints named a 773 caller ID in the 33 days to 30 October 2026, putting it 150th of 422 codes with five or more complaints.
Who holds 773 number blocks
Share of the 786 assigned NXX blocks (100% of the 786 possible), across 22 carriers. This is share of number blocks, not of subscribers.
- AT&T46.3%
- T-Mobile22%
- Verizon13.4%
- Lumen4.6%
- Windstream4.2%
- Other CLEC / VoIP3.1%
- Onvoy2%
- Spok1.7%
- Bandwidth0.9%
- American Messaging0.8%
- Comcast0.6%
- Peerless0.4%
- Charter0.1%
Spam complaints naming 773
FTC Do Not Call complaints where the caller ID was a 773 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 773
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 11.
Timeline
- 1996 773 goes into service, split from or overlaid on 312.
More about 773
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 773
What state is area code 773?
Illinois. It covers the same area as 773/872.
Can I still get a 773 number?
Only from recycled stock. 786 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (773/872).
Is a call from 773 a scam?
Not by itself. 773 drew 667 FTC complaints in the 33 days to 30 October 2026, 150th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 773 numbers?
AT&T holds the largest share of assigned number blocks at 46.3%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 773?
NANPA records the local dialing plan for 773 as “1+10D”.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “1+10D”. Reviewed by the data desk. Spotted an error? Request a correction.