ZIP Code 10546 — Millwood, NY
10546 is a standard (street delivery) ZIP code serving Millwood, 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 10546 at a glance
| ZIP code | 10546 |
|---|---|
| Primary city | Millwood |
| State | New York (NY) |
| County | Westchester FIPS 36119 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,392 |
| Coordinates | 41.194720, -73.800200 |
How ZIP+4 works in 10546
The four digits after the hyphen encode a delivery segment inside 10546. 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 10546 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 10546.
| ZIP | City | Distance |
|---|---|---|
| 10562 | Ossining, NY | 1.6 mi |
| 10514 | Chappaqua, NY | 2.1 mi |
| 10545 | Maryknoll, NY | 2.1 mi |
| 10510 | Briarcliff Manor, NY | 4.1 mi |
| 10549 | Mount Kisco, NY | 4.2 mi |
| 10520 | Croton On Hudson, NY | 4.2 mi |
| 10570 | Pleasantville, NY | 4.6 mi |
| 10594 | Thornwood, NY | 5.7 mi |
| 10598 | Yorktown Heights, NY | 6.1 mi |
| 10507 | Bedford Hills, NY | 6.3 mi |
| 10532 | Hawthorne, NY | 6.6 mi |
| 10504 | Armonk, NY | 6.6 mi |
Questions about 10546
What is the ZIP+4 code for 10546?
10546 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 10546, you need to look up a specific street address to get them.
What city is 10546?
10546 is assigned to Millwood, 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.