Introduction
Long Island has two faces, and its phone numbers tell them apart. A 631 number reads as Suffolk County, the eastern half. A 516 number means Nassau County — the dense, commuter-belt stretch just past the New York City line.
For a business courting Long Island customers, that distinction is worth real money. This guide covers exactly where the 516 area code reaches, the towns it serves, the new 363 overlay, the time zone, and how to get a 516 number from anywhere.
WHERE THE 516 AREA CODE COVERS
The 516 area code maps to one place with no ambiguity: Nassau County, on the western half of Long Island, New York.
Nassau County, Start to Finish
516 covers the entire county — from the Queens border on the west to the Suffolk County line on the east. Roughly 1.4 million people live inside it.
It does not extend into Suffolk County (that is 631) or into the New York City boroughs (212, 718, 347, and others).
A Commuter and Business Hub
Nassau County is one of the most densely populated suburban counties in the US. It blends bedroom communities, regional offices, healthcare networks, and retail corridors — a serious market for any service business.
THE TOWNS AND COMMUNITIES 516 CONNECTS
Nassau County is organized into three towns plus two cities, and 516 serves all of them.
The Three Towns
| Town | Notable Communities |
|---|---|
| Hempstead | Hempstead, Levittown, Freeport, Garden City |
| North Hempstead | Great Neck, Manhasset, Port Washington |
| Oyster Bay | Hicksville, Massapequa, Plainview |
The Two Cities
Nassau County also contains two incorporated cities — Long Beach on the south shore and Glen Cove on the north shore. Both carry 516 numbers.
That spread, from Levittown to Great Neck, is why a 516 number signals "Long Island local" so clearly.
Ready when you are
Protect your business line.
MCM's local numbers ship with verified caller ID and smart call filtering — customers always know it's really you, and spam never reaches your team.
A SHORT HISTORY OF 516
516 was created in 1951, in the early wave of area code expansion across New York State. For decades it covered all of Long Island — both Nassau and Suffolk.
The 1999 Split
As Long Island's population grew, one code could not keep up. In 1999, Suffolk County split off to form the 631 area code.
That split left 516 as the dedicated Nassau County code — the boundary it still holds in 2026.
THE 363 OVERLAY: WHAT CHANGED IN 2023
Nassau County eventually ran low on available 516 numbers. Rather than split the county again, regulators added an overlay.
363 Shares the Same Map
The 363 area code went live on January 20, 2023. It covers the identical geographic area as 516 — all of Nassau County.
New phone lines requested after that date may be assigned a 363 number instead of a 516 one. Both codes now coexist across the county.
Your Existing 516 Number Did Not Change
If you already held a 516 number, nothing changed. You keep your number, your area code, and your dialing habits exactly as they were.
Good to know: A virtual 516 number works the same whether your team sits in Garden City or another state entirely — see our overview of virtual phone numbers.
10-Digit Dialing Is Required
Because two codes now share Nassau County, every local call must be dialed with the full 10 digits — area code plus the seven-digit number. This has been the rule since the overlay took effect.
TIME ZONE AND DIALING
The 516 area code sits in the Eastern Time Zone, observing Eastern Standard Time and Eastern Daylight Time.
That means it runs on New York City time — schedule client calls accordingly if you are based elsewhere.
WHY A 516 NUMBER HELPS A BUSINESS
In a suburban market like Nassau County, a local number is a quiet but powerful trust signal.
It Reads as a Neighbor, Not an Outsider
Nassau County residents recognize 516 instantly. A matching number tells them you serve their area — not a call center two time zones away.
Local Numbers Get Answered
People are far more likely to pick up a call from a familiar area code. For sales teams and service businesses, that lift in answer rates is the whole point.
It Works for Remote and Multi-Location Teams
A virtual 516 number routes calls over the internet to any device. You can project a Nassau County presence while your staff works from anywhere.
HOW TO GET A 516 NUMBER
You do not need a Long Island office to claim a 516 number. VoIP removed the address requirement.
Step 1: Choose a VoIP Provider
Pick a provider with a genuine inventory of New York numbers and dependable call quality. MCM carries 516 numbers among its US options.
Step 2: Search for an Available 516 Number
Use the provider's portal to find an open 516 number. With the 363 overlay now active, true 516 numbers are more limited — search early if the prefix matters to you.
Step 3: Configure Routing and Features
Set where calls ring, then add an auto-attendant, call forwarding, voicemail-to-email, and business texting. A small team can sound like an established Nassau County firm.
KEY TAKEAWAYS
The 516 area code is Nassau County's identity in three digits — Long Island's western half, distinct from Suffolk's 631 and from the NYC boroughs.
If a Nassau County presence matters to your business, act on two facts: the 363 overlay means 516 numbers are getting scarcer, and you no longer need a Long Island address to get one.
Want a Nassau County number that rings wherever you work? Check available 516 numbers with MCM — no contracts, ready in minutes.
Ready when you are
Ready to sound local everywhere you sell?
MCM activates business numbers in minutes, with call routing, analytics, and CRM-ready integrations. Start your free trial — no card to browse inventory.
FAQs
Where is the 516 area code located?
516 serves Nassau County on the western half of Long Island, New York. It covers the towns of Hempstead, North Hempstead, and Oyster Bay, plus the cities of Long Beach and Glen Cove.
What is the 363 area code, and how does it relate to 516?
363 is an overlay added in January 2023. It covers the exact same area as 516 — all of Nassau County — and new lines may be assigned a 363 number instead of a 516 one.
Did the 363 overlay change my existing 516 number?
No. If you already had a 516 number, you keep it unchanged. The overlay only affects new lines, which may receive a 363 number.
What time zone is the 516 area code in?
The 516 area code is in the Eastern Time Zone, observing Eastern Standard and Eastern Daylight Time — the same as New York City.
Do I have to dial 10 digits for local calls in the 516 area?
Yes. Because 516 and 363 share Nassau County, all local calls must be dialed with the full 10 digits — the area code plus the seven-digit number.
Can I get a 516 number without living on Long Island?
Yes. A VoIP provider can assign you a 516 virtual number that rings on any device, anywhere. No Nassau County address is needed.
