Mount Sinai, NY Area Codes
Mount Sinai, New York (population 11,876) uses area codes 631 and 934.
Mount Sinai has no telephone exchange of its own in NANPA records; it is served by the Port Jefferson exchange about 2.7 km away.
Carriers with Mount Sinai numbers
17 prefixes are assigned to the Port Jefferson exchange: 0% mobile, 47% VoIP and cable, 53% landline.
| Carrier | Prefixes |
|---|---|
| Verizon | 6 |
| Verizon Business (MCImetro) | 3 |
| Csc Voice | 2 |
| Onvoy (Sinch) | 2 |
| Peerless Network | 1 |
| Paetec Itel | 1 |
| Cablevision Lightpath | 1 |
| Lumen (Level 3) | 1 |
Area codes used in Mount Sinai
| Area code | Prefixes serving Mount Sinai | Main carriers in this code |
|---|---|---|
| 631 | 15 | Verizon, Verizon Business (MCImetro), T-Mobile |
| 934 | 2 | Onvoy (Sinch), Fractel, T-Mobile |
Mount Sinai phone number prefixes
Numbers starting with these first six digits were originally assigned to the Port Jefferson exchange.
631-331Verizon631-403Verizon Business (MCImetro)631-473Verizon631-474Verizon631-476Verizon631-509Csc Voice631-535Peerless Network631-642Verizon631-743Csc Voice631-791Verizon Business (MCImetro)631-802Paetec Itel631-828Cablevision Lightpath631-928Verizon631-938Lumen (Level 3)631-978Verizon Business (MCImetro)934-239Onvoy (Sinch)934-400Onvoy (Sinch)
Nearby cities in area code 631
- West Babylon
- Coram
- Central Islip
- Commack
- Huntington Station
- Centereach
- Bay Shore
- Shirley
- Deer Park
- Lindenhurst
- West Islip
- Holbrook
Questions
- What is the area code for Mount Sinai, NY?
- Mount Sinai uses 2 area codes: 631 and 934. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Mount Sinai in?
- Mount Sinai is in the Eastern time zone.