ZIP Code 11963 — Sag Harbor, NY
11963 is a standard (street delivery) ZIP code serving Sag Harbor, New York, in Suffolk County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 11963 at a glance
| ZIP code | 11963 |
|---|---|
| Primary city | Sag Harbor |
| State | New York (NY) |
| County | Suffolk FIPS 36103 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 8,390 |
| Coordinates | 40.999210, -72.322710 |
How ZIP+4 works in 11963
The four digits after the hyphen encode a delivery segment inside 11963. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 11963 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 11963.
| ZIP | City | Distance |
|---|---|---|
| 11964 | Shelter Island, NY | 4 mi |
| 11932 | Bridgehampton, NY | 4.6 mi |
| 11962 | Sagaponack, NY | 5 mi |
| 11976 | Water Mill, NY | 5 mi |
| 11975 | Wainscott, NY | 5 mi |
| 11965 | Shelter Island Heights, NY | 5.5 mi |
| 11937 | East Hampton, NY | 6.3 mi |
| 11971 | Southold, NY | 6.8 mi |
| 11944 | Greenport, NY | 7.3 mi |
| 11958 | Peconic, NY | 7.7 mi |
| 11956 | New Suffolk, NY | 7.7 mi |
| 11968 | Southampton, NY | 8.5 mi |
Questions about 11963
What is the ZIP+4 code for 11963?
11963 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 11963, you need to look up a specific street address to get them.
What city is 11963?
11963 is assigned to Sag Harbor, New York, in Suffolk County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.