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
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
Unique Facts About Area Code 363
From its earliest days, area code 363 has played a specific role in the region. Source: NY PSC Case 21-C-0473.
- 49 years of estimated relief: The 363 overlay was designed to provide 49 years of numbering relief for Nassau County, nearly double the approximately 22 years that would have resulted from the rejected boundary-elimination alternative. The New York PSC selected the overlay approach specifically for its longer-term sustainability. (Source: NY PSC Order 21-C-0473)
- Compressed 9-month implementation: The 363 overlay was activated in just 9 months (approved January 2022, activated January 2023) versus the typical 18-month timeline for area code relief. This compression was possible because mandatory 10-digit dialing was already in effect in the 516 region since July 16, 2022, due to the national 988 Suicide and Crisis Lifeline rollout. (Source: NY PSC Press Release)
- Boundary elimination considered and rejected: The New York PSC considered a boundary-elimination alternative that would have expanded area code 934 (overlaying 631) to also overlay 516, merging all of Long Island under a single overlay structure. Industry consensus supported the all-services overlay approach as providing longer-term relief with less consumer disruption. (Source: NY PSC Order 21-C-0473)
- Nassau County only: Area code 363 serves exclusively Nassau County. It does not serve Suffolk County (which has 631/934). The overlay boundary matches the original 516 boundary exactly. (Source: Wikipedia)
- NANPA petition date: The NANPA petition triggering the 363 overlay was filed on September 2, 2021, projecting 516 number exhaustion by Q2 2023. This date was revised forward from Q3 2023 in October 2021, accelerating the regulatory timeline. (Source: NY PSC Case 21-C-0473)
FCC 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) |
Demographics & Economics
- Total Population
- 1,489,965
- Population Density
- 4,714 people/sq miabove U.S. average (U.S.: 94 people/sq mi)
- Median Household Income
- $143,408above U.S. median (U.S.: $78,538)
- Poverty Rate
- 5.7%below U.S. average (U.S.: 12.4%)
- Unemployment Rate
- 4.9%near U.S. average (U.S.: 5.2%)
- Education Attainment
- Bachelor's Degree+47.8%above U.S. average (U.S.: 35.0%)High School or Lower26.0%
Statistics are population-weighted aggregations from Census ACS 5-year estimates.See Sources for details.
Geographic Coverage
State
NY
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
Time Zone
- Eastern Time (ET)
Current Time
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 363).
| County | Population | Share |
|---|---|---|
| Nassau, NY | 1,367,166 | 91.8% |
| Queens, NY | 68,058 | 4.6% |
| Suffolk, NY | 54,741 | 3.7% |
Call Context
This area code serves a major metropolitan region with high population density in NY. The primary city is Hempstead.
Nearby Area Codes
Area codes geographically closest to 363.
Other Area Codes in New York
Area codes that also serve New York, linked for easy comparison.
Frequently Asked Questions
Common questions about area code 363 and how phone numbering works.
NY PSC Order 21-C-0473 and press release.
NY PSC chose all-services overlay over merging 516 with 631/934 (which would have provided ~22 years of relief).
Phone numbers assigned to area code 363 are tied to where they were originally provisioned — not the caller's current location. This code serving roughly 1490k people covers Hempstead in NY, so a number originally set up there will retain the 363 prefix even if the owner moves or uses VoIP. As a densely populated metro area, Hempstead sees high call volume from both local and redirected numbers. Mobile phones keep their original number when users relocate, and businesses often adopt local area codes to establish a regional presence.
Start by looking up the area code on this site to understand its geographic context — area code 363 is associated with Hempstead in NY. For caller-specific details, use your carrier's caller ID features or check public directories. If you suspect fraud, you can report it to the FTC. To file a complaint about robocalls or spoofed numbers, visit the FCC Consumer Complaint Center. You can also register with the National Do Not Call Registry.
When an area's available number pool runs low, regulators introduce an "overlay" code covering the same territory. Both codes coexist, and new numbers are assigned from whichever has availability. Area code 363 serves the Hempstead region in NY, where growing demand for phone numbers necessitated an additional code. This area code shares its region with area code 516. Learn more in our overlay vs split guide.