773 Area Code — IL
Area code 773 serves IL in the Central time zone, in service since 1996. The FCC has 120 unwanted-call complaints against 111 different 773 numbers on record. Look up the exact number that called you below.
Most-reported 773 numbers
Ranked by FCC unwanted-call complaints. Click a number for its full report.
773 unwanted-call complaints, last 12 months
Monthly FCC complaint volume against 773 numbers. Spikes usually mark an active robocall campaign cycling through the code.
Carriers operating in 773
Carriers assigned to 773 prefixes that visitors have looked up so far — resolved from official NPA-NXX assignment records.
- MCIMETRO ACCESS TRANSMISSION SERVICES LLCC · 1 prefix
About area code 773
- Serves
- IL
- Time zone
- Central
- In service since
- 1996-10-12
- Overlay
- Yes — 10-digit dialing
Source: NANPA numbering records, refreshed weekly.
Spam calls from 773? What to know
Seeing repeated missed calls from 773 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in IL — spoofing software displays whatever digits the campaign chooses. Never call unknown numbers back; look them up first, and report unwanted calls to the FCC to build the public record.
Area code 773 FAQs
Where is area code 773?
Area code 773 serves IL, in the Central time zone. It is part of an overlay complex, so multiple area codes serve the same territory and 10-digit dialing is required. It has been in service since 1996.
Why do I keep getting calls from 773 numbers?
Robocallers use "neighbor spoofing" — displaying a number with a local area code to make you more likely to answer. A call showing area code 773 may not originate from IL at all. Look up the full 10-digit number on this site to see its complaint history before calling back.
Are 773 numbers safe to call back?
Area codes themselves are neither safe nor unsafe — 773 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 120 unwanted-call complaints against 111 distinct 773 numbers in our current data window. Check the specific number's report page before returning a missed call.