203 Area Code — Scam Calls, Location & Who's Calling
Area code 203 serves Connecticut in the Eastern time zone, in service since 1947. The FCC has 4,831 unwanted-call complaints against 3,379 different 203 numbers on record. Look up the exact number that called you below.
Most-reported 203 numbers
Ranked by FCC unwanted-call complaints. Click a number for its full report.
- (203) 318-••••66 complaints · 2015-10-06
- (203) 204-••••47 complaints · 2016-02-16
- (203) 409-••••40 complaints · 2019-03-29
- (203) 549-••••40 complaints · 2017-03-28
- (203) 549-••••33 complaints · 2017-05-25
- (203) 583-••••33 complaints · 2016-07-07
- (203) 747-••••31 complaints · 2023-09-14
- (203) 983-••••31 complaints · 2017-07-21
- (203) 983-••••26 complaints · 2018-02-09
- (203) 549-••••24 complaints · 2017-05-16
- (203) 358-••••22 complaints · 2015-07-10
- (203) 734-••••20 complaints · 2018-08-15
- (203) 286-••••19 complaints · 2018-03-15
- (203) 274-••••19 complaints · 2017-09-07
- (203) 318-••••18 complaints · 2018-07-06
- (203) 484-••••17 complaints · 2017-06-01
- (203) 299-••••16 complaints · 2018-06-19
- (203) 566-••••16 complaints · 2015-07-17
- (203) 893-••••15 complaints · 2021-11-02
- (203) 481-••••15 complaints · 2018-03-02
- (203) 864-••••14 complaints · 2015-07-01
- (203) 582-••••13 complaints · 2019-12-14
- (203) 418-••••13 complaints · 2018-09-28
- (203) 529-••••13 complaints · 2017-05-12
- (203) 760-••••13 complaints · 2016-09-07
203 unwanted-call complaints, last 12 months
Monthly FCC complaint volume against 203 numbers. Spikes usually mark an active robocall campaign cycling through the code.
Carriers operating in 203
Carriers assigned to 203 prefixes that visitors have looked up so far — resolved from official NPA-NXX assignment records.
- SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTI · 33 prefixes
- PAETEC ITEL, LLCC · 16 prefixes
- TELEPORT COMMUNICATIONS AMERICA, LLC - CTC · 16 prefixes
- LEVEL 3 COMMUNICATIONS, LLC - CTC · 16 prefixes
- NEW CINGULAR WIRELESS PCS, LLC - DCWireless · 7 prefixes
- MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CTC · 7 prefixes
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTWireless · 6 prefixes
- CABLEVISION LIGHTPATH, INC. - CTC · 6 prefixes
About area code 203
- Serves
- Connecticut
- Time zone
- Eastern
- In service since
- 1947-01-01
- Overlay
- Yes — 10-digit dialing
Source: NANPA numbering records, refreshed weekly.
Spam calls from 203? What to know
Seeing repeated missed calls from 203 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in Connecticut — 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 203 FAQs
Where is area code 203?
Area code 203 serves Connecticut, in the Eastern 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 1947.
Why do I keep getting calls from 203 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 203 may not originate from Connecticut at all. Look up the full 10-digit number on this site to see its complaint history before calling back.
Are 203 numbers safe to call back?
Area codes themselves are neither safe nor unsafe — 203 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 4,831 unwanted-call complaints against 3,379 distinct 203 numbers in our current data window. Check the specific number's report page before returning a missed call.