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Before You Call Back

Area code 203

Area code 203 serves Connecticut, including New Haven, Stamford and Bridgeport (Eastern time). It has been in service since January 1, 1947 and shares its area with 475.

Numbers starting with 203 drew 1,191 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 619 complaints to the FCC since November 2023. The number on your screen can be faked, so a 203 number proves nothing about where a call came from.

Location
Connecticut(new Haven-Milford, CT Metropolitan Statistical Area) and Bridgeport-Stamford-Norwalk, CT Metropolitan Statistical Area
Time zone
Eastern
In service since
January 1, 1947
Overlay
Same area as 475
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
784 of 792held by 22 carriers
Projected to run out
3Q 2061NANPA forecast 2026.2

Complaints about 203 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 203. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

1,191

FCC complaints since November 2023

619

Different 203 numbers reported

1,598

FCC complaints naming a 203 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202325
December 202315
January 202424
February 202423
March 202420
April 202418
May 202411
June 202412
July 202430
August 202440
September 202424
October 202423
November 202424
December 202414
January 202514
February 202517
March 202515
April 202511
May 202520
June 202516
July 202523
August 202512
September 20257
October 20250
November 20254
December 20259
January 202617
February 202614
March 202611
April 202618
May 20267
June 202616
July 202618
August 202617
September 20269
October 202625

What people said 203 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 637 of 1,191 reports were robocalls.

Show as a table
SubjectReports
Other463
Dropped call or no message271
Calls pretending to be government, businesses, or family and friends120
Reducing your debt (credit cards, mortgage, student loans)111
Medical and prescriptions43
Warranties and protection plans24

Most reported 203 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 203

NANPA lists 33 rate centers for 203. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • New Haven145
  • Stamford97
  • Bridgeport94
  • Norwalk60
  • Danbury54
  • Waterbury52
  • Greenwich27
  • Meriden24
  • Ansonia-Derby17
  • Westport16
  • Darien15
  • Fairfield15
  • Huntington14
  • Milford14
  • Wallingford14
  • Trumbull13
  • Branford10
  • Cheshire10
  • New Canaan9
  • Old Greenwich9
  • Byram8
  • Guilford8
  • Wilton8
  • Woodbury8
Show all 33 rate centers

Madison, Naugatuck, Xxxxxxxxxx, Newtown, Ridgefield, Seymour, Wolcott, Georgetown, Redding.

Phone companies holding 203 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 60% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 22 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
Southern New England Telco dba Frontier Comm of CT338
Cellco Partnership dba Verizon Wireless - CT61
New Cingular Wireless PCS, LLC - DC52
Omnipoint Communications, Inc. - CT47
Level 3 Communications, LLC - CT41
Paetec Itel, LLC40
Mcimetro Access Transmission Services LLC - CT37
Teleport Communications America, LLC - CT33

When today's 203 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200126
200210
200310
200412
20055
20067
20075
200817
20108
201113
20127
20132
20152
20211
20241

Check a 203 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Connecticut

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show