ZIP Code 11724 — Cold Spring Harbor, NY
11724 is a standard (street delivery) ZIP code serving Cold Spring 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 11724 at a glance
| ZIP code | 11724 |
|---|---|
| Primary city | Cold Spring Harbor |
| State | New York (NY) |
| County | Suffolk FIPS 36103 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,073 |
| Coordinates | 40.865220, -73.452880 |
How ZIP+4 works in 11724
The four digits after the hyphen encode a delivery segment inside 11724. 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 11724 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 11724.
| ZIP | City | Distance |
|---|---|---|
| 11743 | Huntington, NY | 1.7 mi |
| 11797 | Woodbury, NY | 3.4 mi |
| 11791 | Syosset, NY | 3.6 mi |
| 11771 | Oyster Bay, NY | 3.8 mi |
| 11721 | Centerport, NY | 4.7 mi |
| 11732 | East Norwich, NY | 4.8 mi |
| 11740 | Greenlawn, NY | 4.8 mi |
| 11765 | Mill Neck, NY | 5.6 mi |
| 11803 | Plainview, NY | 5.9 mi |
| 11746 | Huntington Station, NY | 6 mi |
| 11747 | Melville, NY | 6.1 mi |
| 11709 | Bayville, NY | 6.3 mi |
Questions about 11724
What is the ZIP+4 code for 11724?
11724 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 11724, you need to look up a specific street address to get them.
What city is 11724?
11724 is assigned to Cold Spring 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.