Home › Connecticut › Derby
Derby, CT Area Codes
Derby, Connecticut (population 12,925) uses area codes 203 and 475.
Derby has no telephone exchange of its own in NANPA records; it is served by the Milford exchange about 11.5 km away.
Carriers with Derby numbers
20 prefixes are assigned to the Milford exchange: 0% mobile, 45% VoIP and cable, 55% landline.
| Carrier | Prefixes |
|---|---|
| Frontier | 7 |
| Onvoy (Sinch) | 5 |
| Cablevision Lightpath | 2 |
| Paetec Itel | 2 |
| At&T - Local | 1 |
| AT&T (Teleport) | 1 |
| Ton80 Communications | 1 |
| Bandwidth | 1 |
Area codes used in Derby
| Area code | Prefixes serving Derby | Main carriers in this code |
|---|---|---|
| 203 | 14 | Frontier, Verizon Wireless, AT&T Mobility |
| 475 | 6 | Onvoy (Sinch), Verizon Wireless, T-Mobile |
Derby phone number prefixes
Numbers starting with these first six digits were originally assigned to the Milford exchange.
203-283Cablevision Lightpath203-301Frontier203-306Paetec Itel203-647Paetec Itel203-693Cablevision Lightpath203-701At&T - Local203-713Onvoy (Sinch)203-783Frontier203-874Frontier203-876Frontier203-877Frontier203-878Frontier203-882Frontier203-951AT&T (Teleport)475-271Onvoy (Sinch)475-294Onvoy (Sinch)475-327Ton80 Communications475-357Onvoy (Sinch)475-549Bandwidth475-996Onvoy (Sinch)
Nearby cities in area code 203
- Bridgeport
- Stamford
- New Haven
- Waterbury
- Norwalk
- Danbury
- Meriden
- West Haven
- Milford
- Shelton
- Naugatuck
- East Haven
Questions
- What is the area code for Derby, CT?
- Derby uses 2 area codes: 203 and 475. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Derby in?
- Derby is in the Eastern time zone.