The 363 area code is Nassau County's newest telephone code — a 2023 overlay layered on top of the long-established 516, covering the same Long Island communities from Hempstead and Long Beach to Garden City, Great Neck, and Levittown. If a number starts with 363, it is a US area code in New York, not an international number. The 516 code remains active alongside it; the two are fully interchangeable across Nassau County.
This guide explains where 363 is, clears up the New Zealand confusion, walks through Nassau County's area code history, covers the time zone, and shows how to get a 363 number.
Where is the 363 area code?
The 363 area code location is Nassau County, New York — the western half of Long Island, immediately east of Queens and Brooklyn. To the east, Suffolk County uses the 631 area code; to the west, New York City's boroughs use 212, 718, 347, and 929. The 363 and 516 area code covers Nassau County only.
Major cities and communities inside the 363 / 516 footprint:
| City / Community | Known for |
|---|---|
| Hempstead | Nassau County's most populous city |
| Garden City | Roosevelt Field Mall, county retail hub |
| Great Neck | North Shore peninsula, commuter town |
| Long Beach | Atlantic Ocean barrier island resort city |
| Mineola | Nassau County seat, government and courts |
| Hicksville | Major LIRR junction, suburban commercial center |
| Levittown | Iconic post-war planned community |
| Freeport | South Shore marina and waterfront dining |
| Rockville Centre | Village shopping and dining district |
| Massapequa | South Shore residential community |
Is 363 a New Zealand number?
No — 363 is a United States area code for Nassau County, New York. New Zealand's international country code is +64, not +363. The confusion arises because some callers receive a 363 number and, not recognizing it, wonder whether it could be international.
Here is the distinction: US phone numbers are always written +1 XXX XXX XXXX — the leading +1 is the US country code, and the three digits that follow (363, 516, 212, etc.) are the US area code. A call from New Zealand would appear as +64, not +363. If your phone shows a 363 number, it is a New York call.
This type of confusion with three-digit codes is common. The 353 area code, for example, is regularly mistaken for Ireland's +353 country code — but it is a US code for Madison, Wisconsin. The rule holds for 363: a 363 number is always in Nassau County, New York.
How 516 became 363
Nassau County's telephone history unfolded in four clear stages:
1951 — Nassau and Suffolk counties on Long Island were assigned 516, split from the original 914 area code that had served the New York suburbs since 1947.
1999 — Demand for phone numbers grew rapidly as mobile and internet services expanded. Suffolk County was split off and given its own code — 631 — while 516 was retained for Nassau County alone.
October 24, 2021 — To make room for the 988 National Suicide Prevention Lifeline, Nassau County transitioned to mandatory ten-digit dialing — area code plus seven-digit number — on every call, even local ones. This applied to both 516 and (later) 363.
2023 — With the 516 number pool thinning, the 363 overlay was announced and began assigning numbers. Existing 516 subscribers kept their numbers unchanged; new lines in Nassau County may now receive either code. Both work identically across the county.
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Nassau County's economy
Nassau County is one of the wealthiest counties in the United States, anchored by proximity to New York City and a dense professional workforce:
- Finance and professional services — A large share of Nassau County residents commute into Manhattan for finance, law, media, and consulting. A 363 or 516 number reaches a highly educated, high-income suburban professional base.
- Healthcare — Long Island Jewish Medical Center (in New Hyde Park) and Nassau University Medical Center are anchor institutions, supported by dozens of specialty practices and outpatient facilities across the county.
- Aviation — Republic Airport in Farmingdale is Nassau County's general aviation hub, supporting corporate, charter, and private aircraft operations.
- Retail — Roosevelt Field Mall in Garden City is one of the largest retail centers on the East Coast. Nassau County's South Shore and North Shore commercial corridors draw regional shoppers.
- Real estate and construction — Nassau County's housing market consistently ranks among the most active and highest-priced in New York State, generating steady demand for real estate, title, legal, and home-services firms.
A 363 number signals local Nassau County presence to clients across Long Island. Contact us to find the right prefix for your business or team.
What time zone is the 363 area code?
The 363 area code time zone is Eastern Time (ET), the same clock as New York City, Boston, and Philadelphia:
- Winter (standard time): Eastern Standard Time (EST), UTC −5
- Summer (daylight saving): Eastern Daylight Time (EDT), UTC −4
New York observes Daylight Saving Time, switching on the second Sunday in March and reverting on the first Sunday in November. When calling a 363 number from other time zones: no adjustment needed from the rest of the Northeast; subtract 1 hour from Central; subtract 2 from Mountain; subtract 3 from Pacific.
Spam and unknown calls from 363 numbers
Because 363 is a new code, many Nassau County residents and businesses are only just encountering it on caller ID for the first time. Some calls that appear as unfamiliar 363 numbers are legitimate — a new neighbor, a recently launched local business, or a VoIP line recently issued with the 363 prefix.
That said, robocallers and scammers do spoof local area codes — including new ones — to appear trustworthy. If a 363 call is unexpected:
- Let it go to voicemail before returning it.
- Do not share account details or one-time codes with an unexpected 363 caller.
- Use your carrier's spam-screening tools; most offer them at no extra cost.
- The FCC's STIR/SHAKEN call authentication framework helps carriers flag suspected spoofed calls before they reach you.
How to get a 363 number
Getting a 363 Nassau County number takes minutes through a VoIP provider:
- Sign up — Create an account with My Country Mobile or another cloud phone provider.
- Search — Enter "363" as the desired area code and browse available numbers.
- Pick a prefix — Choose a number with a Hempstead, Garden City, or Mineola exchange to match your local presence.
- Select a plan — Add the features your business needs: call routing, auto-attendant, voicemail-to-email, SMS, or analytics.
- Go live — Activate in minutes and start receiving calls and texts from Nassau County immediately.
Key takeaways
- 363 is the new overlay for 516 in Nassau County, New York — both codes serve Long Island's western half identically.
- The overlay was announced in 2023; ten-digit dialing has been required in the area since October 2021.
- 363 is a US area code, not a New Zealand number — New Zealand's country code is +64, not +363.
- Time zone is Eastern (ET) — UTC −5 in winter, UTC −4 during Daylight Saving Time.
- Nassau County is one of the US's wealthiest counties, with strong finance, healthcare, retail, and aviation sectors.
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Frequently asked questions
What is the 363 area code?
Area code 363 is a New York telephone area code serving Nassau County on Long Island. It is an overlay of the 516 area code, introduced in 2023, covering communities including Hempstead, Garden City, Great Neck, Long Beach, Mineola, Hicksville, and Levittown.
Where is the 363 area code located?
The 363 area code is in Nassau County, New York — the western half of Long Island, east of Queens and Brooklyn. It does not cover Suffolk County (631) or New York City's boroughs (212, 718, 347, 929).
Is 363 a New Zealand area code?
No. Area code 363 is a US area code for Nassau County, New York. New Zealand's country code is +64. A 363 number always originates in the United States — specifically on Long Island.
What time zone is the 363 area code?
Area code 363 is in the Eastern Time Zone — EST (UTC −5) in winter and EDT (UTC −4) during Daylight Saving Time. This matches New York City, Boston, and all of the US Northeast.
Are 363 and 516 the same?
Yes, for all practical purposes. Both codes cover the exact same Nassau County geography with the same call rates and dialing rules. Existing 516 subscribers kept their numbers; new lines may be assigned 363. Ten-digit dialing is required for all calls in the area.
What cities are in the 363 area code?
Nassau County communities include Hempstead, Garden City, Great Neck, Long Beach, Mineola, Hicksville, Levittown, Freeport, Rockville Centre, and Massapequa, among many others. Suffolk County to the east uses 631, not 363.
Why am I getting calls from 363 numbers?
363 is a newly active code, so unexpected 363 calls may be from legitimate new local businesses, neighbors, or recently issued VoIP lines — or from robocallers spoofing a Nassau County number. If in doubt, let it go to voicemail before returning the call.
How do I get a 363 area code number?
Sign up with a VoIP provider, search for 363 numbers, select a Nassau County prefix, choose a plan, and activate. Most providers issue a 363 number in under five minutes.
