North American Numbers Source-cited · ownership disclosed
Area code
516
In service
United States · since 1951

Nassau County

Serves Nassau County on Long Island. Split from 914 in 1951; Suffolk County (631) later split off in 1999.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Nassau County
Type
geographic
Status
in service
In service since
1951
Projected exhaust
2073 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 516 is

Nassau County, Long Island, New York.

Communities served wholly or partly by 516:

HempsteadLong BeachGlen CoveFreeportLevittownGarden City

Representative Nassau County communities.

B · Relationships

How it relates to other codes

The codes 516 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1951 914 Westchester County Long Island split from 914 to form 516 in 1951.
Spawned · 1999 631 Suffolk County Suffolk County split off as 631 on Nov 1, 1999.
Overlay · 2023 363 Nassau County (overlay) 363 overlays 516 (Nassau County).
What's changing. Overlaid by 363 across Nassau County; ten-digit dialing required.
C · History

How 516 got here

1947
Nassau and Suffolk initially part of area code 914.
Source: Wikipedia 516/363
1951
Nassau and Suffolk split from 914 into the new 516.
Source: Wikipedia 516/363
1999-11-01
Suffolk County split off as 631; Nassau retained 516.
Source: Wikipedia 516/363
2023-01-20
363 announced as an overlay.
Source: Wikipedia 516/363
D · Capacity

How full it is

Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
3,607

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 516 with another code →
Sources
Wikipedia (secondary) ↗
Area codes 516 and 363
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.