ZIP Code 10504 — Armonk, NY
10504 is a standard (street delivery) ZIP code serving Armonk, 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 10504 at a glance
| ZIP code | 10504 |
|---|---|
| Primary city | Armonk |
| State | New York (NY) |
| County | Westchester FIPS 36119 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 7,665 |
| Coordinates | 41.130650, -73.706290 |
How ZIP+4 works in 10504
The four digits after the hyphen encode a delivery segment inside 10504. 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 10504 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 10504.
| ZIP | City | Distance |
|---|---|---|
| 10594 | Thornwood, NY | 3.5 mi |
| 06831 | Greenwich, CT | 3.8 mi |
| 10570 | Pleasantville, NY | 4.3 mi |
| 10514 | Chappaqua, NY | 4.5 mi |
| 10549 | Mount Kisco, NY | 4.8 mi |
| 10595 | Valhalla, NY | 4.9 mi |
| 10604 | West Harrison, NY | 5.2 mi |
| 10532 | Hawthorne, NY | 5.4 mi |
| 10506 | Bedford, NY | 5.5 mi |
| 10577 | Purchase, NY | 6.4 mi |
| 10546 | Millwood, NY | 6.6 mi |
| 10603 | White Plains, NY | 6.6 mi |
Questions about 10504
What is the ZIP+4 code for 10504?
10504 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 10504, you need to look up a specific street address to get them.
What city is 10504?
10504 is assigned to Armonk, 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.