Area code
Area code 203 — New Haven & Stamford, CT
Connecticut · in service since 1947
Area code 203 covers New Haven & Stamford, CT. It is an overlay: 475 serves the same area, so neighbors can have different area codes.
Overlay, same area: 475
Local time in New Haven & Stamford
Spam reports from Sep 23 – Oct 22, 2026
Average #230 of 461 codes
396 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneEastern Time
- Local calls10 digits
- Prefixes800 assigned
- Runs out~4Q 2055
- Unwanted call?Block & report
Spam call reports about 203 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 25 |
| Sep 14 | 100 |
| Sep 21 | 98 |
| Sep 28 | 86 |
| Oct 5 | 94 |
| Oct 12 | 83 |
| Oct 19 (4 days) | 64 |
Compared with all codes
- Robocalls
- 70%all codes 75%
- Callers with the same code
- 52%all codes 35%
- Rank by complaints
- #230of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 8314 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Dropped call or no message | 85 15% | |
| Reducing your debt (credit cards, mortgage, student loans) | 66 12% | |
| Calls pretending to be government, businesses, or family and friends | 59 11% | |
| Medical & prescriptions | 20 4% | |
| Warranties & protection plans | 15 3% | |
| Lotteries, prizes & sweepstakes | 9 2% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Connecticut | 321 58% | |
| California | 31 6% | |
| New York | 28 5% | |
| Florida | 16 3% | |
| Massachusetts | 16 3% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 203 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| NEW HAVEN | New Haven | New Haven County | 145 |
| STAMFORD | Stamford | Fairfield County | 97 |
| BRIDGEPORT | Bridgeport | Fairfield County | 94 |
| NORWALK | Norwalk | Fairfield County | 60 |
| DANBURY | Danbury | Fairfield County | 54 |
| WATERBURY | Waterbury | New Haven County | 52 |
| GREENWICH | Greenwich | Fairfield County | 27 |
| MERIDEN | Meriden | New Haven County | 24 |
| ANSONIDRBY | — | — | 17 |
| WESTPORT | — | — | 16 |
Plus 22 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- Connecticut
- Assigned by NANPA
- 1947
- Local dialing
- 10 digits (NANPA: 10D)
- NANPA planning letters
- PL-388, PL-255, PL-217, PL-138
Source: NANPA, NPA database of Oct 24, 2026.
Is 203 running out of numbers?
Previous forecast (October 2025): 2050, moved later by 5 years.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 203 prefixes
The five largest of 23 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Frontier Comm Of CT | 338 42% | |
| Verizon Wireless | 61 8% | |
| New Cingular Wireless PCS, LLC | 52 6% | |
| Omnipoint Communications, Inc. | 47 6% | |
| Level 3 Communications, LLC | 41 5% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 203
What area code is 203?
A Connecticut area code, in service since 1947.
Where is 203 area code, and what time zone is it in?
New Haven & Stamford, CT; Eastern Time.
Why am I getting spam calls from 203?
396 FTC complaints from Sep 23 – Oct 22, 2026, most often about dropped calls or no message (not verified by the FTC; caller ID can be spoofed).
Will 203 get a new area code?
NANPA forecasts exhaust in 4Q 2055; no relief planning listed.