203 Area Code: New Haven, Connecticut
Area code 203 serves New Haven, Stamford and Bridgeport, Connecticut in the Eastern time zone, in service since 1947. Consumers have filed 5,834 unwanted-call complaints against 4,296 different 203 numbers, 362 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 203 at a glance
- State
- Connecticut
- Main cities
- New Haven, Stamford, Bridgeport, Norwalk, Danbury, Waterbury + 26 more
- Counties
- Western Connecticut Planning Region, South Central Connecticut Planning Region, Greater Bridgeport Planning Region, Naugatuck Valley Planning Region
- Local time
- —Eastern
- In service since
- 1947
- Overlay code
- 475 (2009)
- Codes split off
- 860 (1995)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 33 rate centers, 784 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 203 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
What calls from 203 numbers are about
991 FTC Do Not Call complaints about 203 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 13% of complaints (59% of those were recorded messages). Overall, 66% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified39740%
- Dropped call / no message15616%
- Impostor (government, business, family)13013%
- Debt reduction10310%
- No subject given939%
- Medical & prescriptions263%
- Home improvement & cleaning253%
FCC complaints by call type, last 2 years
- Live Voice10851%
- Prerecorded Voice7937%
- Text Message2512%
12% of recent FCC complaints about 203 numbers are about text messages, not calls.
When 203 spam calls come in
31% of complaints that give a call time describe calls between 10am and 1pm. 92% came Monday to Friday, most on Fridays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
357 FTC complaints about 203 numbers in the last four weeks, up 7% on the four weeks before. FCC complaints about 203 numbers peaked in 2018 (929); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
58% of the FTC complaints about 203 numbers came from people whose own phone number also starts with 203, and 64% from Connecticut. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
Where complainants live
- Connecticut63664%
- California374%
- New York303%
- Massachusetts222%
- Pennsylvania202%
What people with 203 numbers report
People whose own number starts with 203 filed 3,325 FTC complaints since Jul 24. 17% were about calls showing another 203 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 203 (same code)57017%
- 4752989%
- 833 (toll-free)2046%
- 8601274%
- 855 (toll-free)913%
Busiest 203 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (203) 760-xxxx | 16 | 14 | Peerless Network | Bridgeport |
| (203) 204-xxxx | 15 | 11 | Teleport Communications America, LLC | Guilford |
| (203) 582-xxxx | 12 | 12 | Frontier Communications | New Haven |
| (203) 433-xxxx | 10 | 9 | Comcast (Xfinity Voice) | Branford |
| (203) 200-xxxx | 7 | 7 | Bandwidth.com | New Haven |
Carriers operating in 203
NANPA has assigned 784 203 prefixes (NPA-NXX central-office codes) across 33 rate centers: 25% to wireless carriers, 75% to landline and VoIP operators; 60% are pooled blocks shared by several carriers. The newest assignment was 2024-09-18. The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Frontier Communications | Incumbent landline (ILEC) | 338(43%) | 31 | 2012-10-31 |
| Verizon Wireless (Cellco Partnership) | Wireless | 61(8%) | 7 | 2015-07-29 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 52(7%) | 10 | 2012-01-18 |
| Omnipoint Communications, INC. | Wireless | 47(6%) | 9 | 2021-12-06 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 41(5%) | 22 | 2013-09-26 |
| PAETEC (Windstream) | Competitive / VoIP (CLEC) | 40(5%) | 24 | 2005-02-03 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 37(5%) | 10 | 2008-10-08 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 33(4%) | 28 | 2015-11-10 |
| Cablevision Lightpath, INC. | Competitive / VoIP (CLEC) | 29(4%) | 15 | 2011-05-25 |
| Metro by T-Mobile (MetroPCS) | Wireless | 25(3%) | 8 | 2011-03-07 |
| Verizon (landline) | Incumbent landline (ILEC) | 15(2%) | 2 | — |
| At&T - Local | Competitive / VoIP (CLEC) | 12(2%) | 12 | — |
Largest rate centers (exchanges) by prefixes: New Haven (145), Stamford (97), Bridgeport (94), Norwalk (60), Danbury (54), Waterbury (52), Greenwich (27), Meriden (24), Ansonia–Derby (17), Westport (16). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 203 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 203 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- If it looks like a neighbor's number, it may be spoofed. See calls from your own area code.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in Connecticut
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: Connecticut Attorney General.
- Connecticut formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 203: questions answered from the data
Where is area code 203?
Area code 203 serves New Haven, Stamford and Bridgeport, Connecticut, covering Western Connecticut Planning Region, South Central Connecticut Planning Region and Greater Bridgeport Planning Region and 1 more county. It has been in service since 1947.
What time zone is area code 203 in?
Area code 203 is in the Eastern time zone (UTC−5, or UTC−4 during daylight saving time). The current local time is shown at the top of this page.
Which area codes overlay 203?
475 (in service 2009) serves the same area as 203. New numbers there can be issued with any of these codes, and local calls need all 10 digits. A spoofed call can display any of them.
What are calls from 203 numbers usually about?
Since Jul 24, consumers filed 991 FTC Do Not Call complaints about 203 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 13% of complaints, 59% of them recorded messages. Across all subjects, 66% of callers who answered the question said the call was a robocall.
When do 203 spam calls happen?
31% of the complaints that give a call time describe calls between 10am and 1pm, and 92% came on weekdays, most often on Friday. Times are as consumers reported them.
Are calls from 203 numbers really local?
Not necessarily. 58% of the FTC complaints about 203 numbers came from people whose own phone number also starts with 203, and 64% from Connecticut. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
Are 203 robocalls increasing?
In the four weeks to Oct 20, consumers filed 357 FTC complaints about 203 numbers, 7% more than the four weeks before.
How do I report a 203 scam call in Connecticut?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In Connecticut, the Connecticut Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.