---
title: "Area code 631: New York, United States"
url: "https://lookvalid.com/area-code/631.md"
canonical_url: "https://lookvalid.com/area-code/631"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 631 serves New York, United States. Number formats, numbering rules, a live phone validator and the other codes in New York."
---

# Area code 631: New York, United States

Area code 631 serves New York, United States. Number formats, numbering rules, a live phone validator and the other codes in New York.

NANPA lists 782 central office codes (prefixes) in use in area code 631, held by 38 holders across 54 rate centers.
Verizon New York holds the most prefixes, 228 (29%). 77% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 4,834 complaints on file for 3,262 numbers in 631, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 1999-11-01
- Time zone: Eastern (E)
- Assigned overlays: 934 (2016-07-16)
- Prefixes in use: 782
- Pooled prefixes: 600 (77%)
- Rate centers: 54
- Companies holding prefixes: 38
- Assignment dates on file: 2001-01-16 to 2025-09-03 (285 prefixes)
- ZIP codes in its places: 34

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| BRENTWOOD | 127 | 16% |
| FARMINGDL | 42 | 5% |
| RIVERHEAD | 40 | 5% |
| HUNTINGTON | 34 | 4% |
| CENTRAISLP | 32 | 4% |
| AMITYVILLE | 31 | 4% |
| BABYLON | 28 | 4% |
| DEER PARK | 27 | 3% |
| 46 other rate centers | 421 | 54% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| Verizon New York | 228 | 29% |
| Mcimetro Access Transmission Services | 65 | 8% |
| Cablevision Lightpath | 55 | 7% |
| Omnipoint Communications | 55 | 7% |
| Level 3 Communications | 53 | 7% |
| New Cingular Wireless PCS | 49 | 6% |
| 32 other carriers | 277 | 35% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1951-01-01: Area code 516, named as the parent of 631 in the NANPA report, was in service.
- 1999-11-01: Area code 631 went into service.
- 2016-07-16: Area code 934 went into service as an overlay in the same area as 631.

## Nearest area codes

The area codes closest to 631, measured between the centers of the ZIP code places they serve, are 516 (about 18 miles), 203 (about 32 miles), 475 (about 32 miles), 551 (about 60 miles) and 860 (about 60 miles).

## ZIP codes

34 ZIP codes fall in places that have a rate center in this area code. The places with the most are Stony Brook, NY (2 ZIP codes), Amagansett, NY (1 ZIP code) and Amityville, NY (1 ZIP code). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

4,834 complaints for 3,262 numbers. Numbers whose latest complaint falls in each year:

- 2023: 128
- 2024: 101
- 2025: 213

## Questions

### Where is area code 631?

NANPA assigns area code 631 to New York, United States.

### In which state does area code 631 sit?

New York. 631 is one of 23 area codes the NANPA table assigns to the state.

### Which places does area code 631 cover?

The places with the most ZIP codes among the rate centers in 631 are Stony Brook, NY, Amagansett, NY and Amityville, NY. The rate center list on this page shows all of them.

### Who owns area code 631?

NANPA assigns area codes. Within 631, Verizon New York holds the most prefixes, 228 prefixes or 29%.

### Which time zone does 631 use?

The NANPA NPA report lists the time zone for 631 as Eastern (E).

### What year did 631 enter service?

The NANPA NPA report gives an in-service date of 1999-11-01, so 631 has been in use since 1999.

### Does area code 631 have an overlay?

Yes. 934 (in service 2016-07-16) shares the same area with 631, so numbers from all of them are local to each other.

### Which area codes are nearest to 631?

The area codes closest to 631, measured between the centers of the ZIP code places they serve, are 516 (about 18 miles), 203 (about 32 miles), 475 (about 32 miles), 551 (about 60 miles) and 860 (about 60 miles).

### How many prefixes does area code 631 have?

NANPA's report dated 2026-10-17 lists 782 prefixes in service in 631, spread over 54 rate centers and 38 holders.

### Are there complaints about 631 numbers?

The FCC data on file has 4,834 complaints for 3,262 numbers in 631. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).