ZIP Code 10590 — South Salem, NY
10590 is a standard (street delivery) ZIP code serving South Salem, New York, in Westchester 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 10590 at a glance
| ZIP code | 10590 |
|---|---|
| Primary city | South Salem |
| State | New York (NY) |
| County | Westchester FIPS 36119 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 6,989 |
| Coordinates | 41.254210, -73.537190 |
How ZIP+4 works in 10590
The four digits after the hyphen encode a delivery segment inside 10590. 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 10590 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 10590.
| ZIP | City | Distance |
|---|---|---|
| 10518 | Cross River, NY | 3.4 mi |
| 10576 | Pound Ridge, NY | 3.4 mi |
| 06877 | Ridgefield, CT | 4 mi |
| 10597 | Waccabuc, NY | 4.2 mi |
| 06897 | Wilton, CT | 6 mi |
| 10560 | North Salem, NY | 6.4 mi |
| 06840 | New Canaan, CT | 6.8 mi |
| 10506 | Bedford, NY | 6.8 mi |
| 10526 | Goldens Bridge, NY | 7 mi |
| 10507 | Bedford Hills, NY | 8 mi |
| 10536 | Katonah, NY | 8 mi |
| 06896 | Redding, CT | 8.3 mi |
Questions about 10590
What is the ZIP+4 code for 10590?
10590 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 10590, you need to look up a specific street address to get them.
What city is 10590?
10590 is assigned to South Salem, New York, in Westchester 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.