ZIP Code 11730 — East Islip, NY
11730 is a standard (street delivery) ZIP code serving East Islip, 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 11730 at a glance
| ZIP code | 11730 |
|---|---|
| Primary city | East Islip |
| State | New York (NY) |
| County | Suffolk FIPS 36103 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 14,247 |
| Coordinates | 40.727010, -73.184560 |
How ZIP+4 works in 11730
The four digits after the hyphen encode a delivery segment inside 11730. 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 11730 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 11730.
| ZIP | City | Distance |
|---|---|---|
| 11751 | Islip, NY | 1.6 mi |
| 11739 | Great River, NY | 1.6 mi |
| 11752 | Islip Terrace, NY | 2.2 mi |
| 11769 | Oakdale, NY | 3 mi |
| 11706 | Bay Shore, NY | 3.3 mi |
| 11722 | Central Islip, NY | 4 mi |
| 11718 | Brightwaters, NY | 4.2 mi |
| 11716 | Bohemia, NY | 4.3 mi |
| 11796 | West Sayville, NY | 4.4 mi |
| 11717 | Brentwood, NY | 5.3 mi |
| 11782 | Sayville, NY | 5.5 mi |
| 11749 | Islandia, NY | 5.5 mi |
Questions about 11730
What is the ZIP+4 code for 11730?
11730 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 11730, you need to look up a specific street address to get them.
What city is 11730?
11730 is assigned to East Islip, 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.