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  3. Area code 631
New York (NY)Eastern Time (ET)

Area Code 631

New York (NY) * Stony Brook, Amagansett, Amityville, Aquebogue, Bay Shore, Bayport, Bellport, Blue Point * Eastern Time (ET)

1.4M

Population

103

ZIP codes

New York

Primary state

Eastern Time (ET)

Time zones

What stands out

  • Coverage: 1.4M people across 103 ZIP codes (primarily Suffolk County, NY).
  • Overlapping area codes: 934
  • Major cities: Stony Brook, Amagansett, Amityville.
Primary state:New York (NY)/Major cities:Stony Brook, Amagansett, Amityville, Aquebogue, Bay Shore, Bayport, Bellport, Blue Point

Browse sections

Basics

Percentiles compare this area code to other area codes nationwide.

Population

1.4M

ZIP codes

103

Median age

42.1 yrs

Population density

1.7K/sq mi

Mean commute time

31 min

Avg. household size

2.9

Neighbors

Neighboring area codes

363516934
Notes & Sources
  • Area-code boundaries can change over time; verify official assignments with NANPA for critical use.
  • In regions with overlapping area codes, new numbers may use a different code.
  • This page aggregates ZIP-based crosswalks for orientation and does not indicate phone-number availability.

Data freshness

ACS 5-year
2020–2024
Page updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

U.S. Census (ACS 5-year)U.S. Census TIGER/LineNANPA

Derived statistics

  • Area codes are not Census geographies; statistics are estimated by aggregating ZCTA (ZIP) values for associated ZIPs.
  • ZIP↔area code associations are derived from NPA boundary polygons and ZCTA centroid points, and can be approximate.
  • Median age, mean commute, and household size are population-weighted; population density uses summed ZIP land area.
Area code overlays and service areas are primarily governed by NANPA; this page uses aggregated geographic overlays for orientation only.

Data accuracy & methodology

This report aggregates 2020–2024 ACS 5-year estimates and geographic overlays for orientation. Area code service areas can cross ZIP/state boundaries and change over time; verify official assignments with NANPA for critical use.