Area Code 363

New York

Area code 363 serves New York, primarily Hempstead, in the Eastern Time (ET) time zone. It is an overlay area code sharing territory with area code 516.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 516 (Hempstead).

In service since: 20-Jan-2023

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,465,782
Population Density: 1,700 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $128,329
above U.S. median (U.S.: $75,144)
Poverty Rate: 6.4%
below U.S. average (U.S.: 11.5%)
Unemployment Rate: 4.6%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
40.1%
above U.S. average (U.S.: 33.7%)
High School or Lower
29.9%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the income ranking and density ranking.

Time Zone

Eastern Time (ET)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Eastern Time (ET)

Prefix Utilization

Geographic Coverage

State

Major Cities

Hempstead
Levittown
Freeport
Hicksville
Valley Stream
Elmont
East Meadow
Long Beach
Uniondale
Baldwin
Oceanside
Franklin Square
Glen Cove
Plainview
Rockville Centre
Massapequa
Merrick
Mineola
North Bellmore
West Hempstead
Lynbrook
East Massapequa
Roosevelt
Syosset

and 109 more cities

Area Code 363 geographic coverage map (light mode)

Historical Timeline of Area Code 363

Area code 363 was activated on January 20, 2023, as an all-services overlay for the 516 area code region in Nassau County, New York. The New York Public Service Commission approved the overlay on January 20, 2022, in Case 21-C-0473, choosing it over a boundary-elimination alternative that would have merged 516 with 631/934. Source: NY PSC Case 21-C-0473.

Key milestones:

1947: AT&T created the original 86 North American area codes. Nassau County, Suffolk County, and the lower Hudson Valley were assigned area code 914.
1951: Area code 516 was created by splitting Nassau and Suffolk counties from 914, reflecting Long Island's growing population. Source: Wikipedia
1999: Area code 631 was split off from 516 on November 1, 1999, serving Suffolk County. Permissive dialing of 516 continued across Long Island until spring 2000. Source: Wikipedia
2021: NANPA projected 516 number exhaust by Q2 2023 (revised from Q3 2023 in October 2021). Mandatory 10-digit dialing had already been implemented in the 516 region due to the national 988 Suicide and Crisis Lifeline rollout, which conflicted with 988 central office codes in 516. Source: NY PSC Press Release
2022: On January 20, 2022, the New York Public Service Commission approved an all-services distributed overlay of 516 with the new area code 363 (Case 21-C-0473). The PSC chose overlay over a boundary-elimination alternative that would have merged 516 with 631/934, providing approximately 22 years of relief versus the overlay's 49-year estimate. Source: NY PSC Order
2023: Area code 363 went into service on January 20, 2023. New telephone number assignments in the 516 region may now receive a 363 prefix. Existing 516 numbers remain unchanged, and calls between 516 and 363 are local. Source: NY PSC Press Release

Regulatory History

Area code 363 was authorized by the New York Public Service Commission under delegated FCC authority (47 C.F.R. §52.19) in Case 21-C-0473, decided January 20, 2022. The regulatory process followed a compressed timeline from NANPA petition to activation, enabled by the pre-existing 10-digit dialing requirement in the 516 region. Source: NY PSC Case 21-C-0473

Year	Event	Docket	Regulatory Action & Impact
2021	NANPA Petition Filed	NANPA Petition	NANPA (Somos) filed petition for relief of the 516 NPA on September 2, 2021, projecting exhaustion by Q2 2023 and recommending an all-services overlay.
2021	Exhaust Projection Revised	NANPA Projections	On October 5, 2021, NANPA revised the exhaust projection for 516 from Q3 2023 to Q2 2023, accelerating the need for relief.
2022	PSC Overlay Approval	21-C-0473	New York Public Service Commission approved all-services distributed overlay of 516 with new area code 363 on January 20, 2022. Chose overlay over boundary-elimination alternative. Estimated 49 years of relief. (Source: NY PSC Order)
2023	Public Notification	Press Release 23-002	On January 13, 2023, the NY PSC announced that 363 takes effect January 20, 2023. New number assignments begin in the 516 region. (Source: NY PSC Press Release)
2023	363 Activation	363 In Service	Area code 363 goes into service on January 20, 2023. New telephone number requests in the 516 region may receive a 363 prefix. (Source: NY PSC Case Page)