New York · Eastern Time
363 Area Code
Area code 363 is in New York, serving Nassau County on western Long Island. It is in the Eastern Time zone. It shares its territory with overlay code 516, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 363 area code?
363 is a New York area code covering Nassau County on western Long Island. In the wider directory it sits in the Northeast region.
Cities in the 363 area code
- Hempstead
- Levittown
- Hicksville
- Freeport
- Valley Stream
- Long Beach
- Glen Cove
- Garden City
- Rockville Centre
- Massapequa
- Baldwin
- Oceanside
- Uniondale
- East Meadow
Counties served by 363
Nassau County.
363 overlay codes and dialing
The 363 territory is covered by an overlay of 2 area codes: 363, 516. All of them serve the same geographic area, and the original code is 516. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 363 area code
363 went into service on January 20, 2023 as an overlay of 516, relieving number exhaustion in the Hempstead area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 363 a scam or spam risk?
363 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 363 number on your screen is no guarantee the caller is in Hempstead, NY or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other New York area codes
Explore more
See every code in New York, compare codes across the Northeast region, or view all Eastern Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
363 area code FAQ
Where is the 363 area code?
The 363 area code is in New York, covering Nassau County on western Long Island, in the Northeast region.
What cities are in the 363 area code?
Cities in the 363 area code include Hempstead, Levittown, Hicksville, Freeport, Valley Stream, Long Beach, Glen Cove, Garden City, Rockville Centre and Massapequa.
What time zone is 363 in?
363 is in the Eastern Time zone.
What is the overlay for the 363 area code?
363 shares its territory with 516. Both codes (363, 516) serve the same area, so 10-digit dialing is required for every call.
When did the 363 area code start?
363 went into service on January 20, 2023 as an overlay of 516.
Do I have to dial 10 digits for 363?
Yes. Because 363 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 363 a toll-free or premium code?
No. 363 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.