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Riverside, CT Area Codes
Riverside, Connecticut (population 9,216) uses area codes 203 and 475.
Riverside has no telephone exchange of its own in NANPA records; it is served by the Old Greenwich exchange about 1.7 km away.
Carriers with Riverside numbers
13 prefixes are assigned to the Old Greenwich exchange: 0% mobile, 69% VoIP and cable, 31% landline.
| Carrier | Prefixes |
|---|---|
| Verizon Business (MCImetro) | 5 |
| Frontier | 3 |
| Onvoy (Sinch) | 2 |
| Cablevision Lightpath | 1 |
| AT&T (Teleport) | 1 |
| Fractel | 1 |
Area codes used in Riverside
| Area code | Prefixes serving Riverside | Main carriers in this code |
|---|---|---|
| 203 | 9 | Frontier, Verizon Wireless, AT&T Mobility |
| 475 | 4 | Onvoy (Sinch), Verizon Wireless, T-Mobile |
Riverside phone number prefixes
Numbers starting with these first six digits were originally assigned to the Old Greenwich exchange.
203-277Verizon Business (MCImetro)203-344Cablevision Lightpath203-369Verizon Business (MCImetro)203-409AT&T (Teleport)203-637Frontier203-698Frontier203-827Verizon Business (MCImetro)203-986Verizon Business (MCImetro)203-990Verizon Business (MCImetro)475-249Frontier475-340Onvoy (Sinch)475-465Onvoy (Sinch)475-946Fractel
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 Riverside, CT?
- Riverside 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 Riverside in?
- Riverside is in the Eastern time zone.