The 363 area code covers the same area as 516, including Nassau County, Farmingdale and 5 more places in New York.
Area code 363 is in New York, on Eastern Time. In the 363 area, phone numbers are given out most in Nassau County, then Suffolk County. It has been in service since January 20, 2023. 516 covers the same area, so two neighbours can have different area codes.
- Where
- Nassau County and Suffolk County, New York
- Time zone
- Eastern Time
- In service since
- January 20, 2023
- Shares its area with
- 516 (since 1951)
- Prefixes in use
- 38
- How to dial
- Local calls need all 10 digits: 363-555-0142.
Find out who called you from a 363 number.
Enter the full 10-digit number to see who it is listed to, the city and state on the listing, and whether it is a mobile, landline or VoIP line. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup.
Nassau County holds 95% of the phone prefixes in area code 363.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 38 prefixes in use shows where 363 numbers are actually given out.
- Nassau County36 prefixes, 95%
- Cold Spring Harbor1 prefix, 3%
- Farmingdale1 prefix, 3%
Each prefix, or block of 1,000 numbers inside it, is also handed to a carrier. A number keeps its digits when its owner switches carrier, so the prefix no longer tells you who carries it today. Our free carrier lookup shows which carrier a 363 number is on now.
363 started in 2023 as an overlay on 516, and its ground has not changed since.
2023
363 starts on January 20, 2023, as an overlay on 516: new numbers on the same ground.
A 363 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 363 are 212, 914 and 201.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
New York has 22 other area codes.
These are the questions people ask most about area code 363.
Where is area code 363?
363 covers Nassau County, Farmingdale, Selden and Cold Spring Harbor and 3 more places in New York. In the 363 area, phone numbers are given out most in Nassau County, then Suffolk County.
What state is area code 363 in?
New York. 363 is a New York area code on Eastern Time.
What cities use area code 363?
The places holding the most 363 prefixes are Nassau County, Farmingdale, Selden, Cold Spring Harbor, Brentwood, Central Islip and Amityville. The count comes from NANPA's prefix assignments as of October 1, 2026.
What time zone is area code 363 in?
363 is on Eastern Time.
When did area code 363 start?
363 went into service on January 20, 2023, as an overlay on 516: new numbers for the same area.
Is 363 the same area as 516?
Yes. 516 (since 1951) covers the same ground as 363. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 363 number?
Local calls need all 10 digits: 363-555-0142.
Is 363 a toll-free number?
No. 363 is a regular area code for Nassau County and Farmingdale in New York, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 363?
The closest are 212/718/917/646/347/929/332/465 (New York City, New York), 914 (Westchester County, New York), 201/551 (Hackensack, New Jersey) and 631/934 (Brentwood, New York), measured between the centres of each area.
Who called me from a 363 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 363 a scam?
363 is a real New York area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.