ZIP Code 10542 — Mahopac Falls, NY
10542 is a standard (street delivery) ZIP code serving Mahopac Falls, New York, in Putnam 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 10542 at a glance
| ZIP code | 10542 |
|---|---|
| Primary city | Mahopac Falls |
| State | New York (NY) |
| County | Putnam FIPS 36079 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Coordinates | 41.371150, -73.764360 |
How ZIP+4 works in 10542
The four digits after the hyphen encode a delivery segment inside 10542. 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 10542 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 10542.
| ZIP | City | Distance |
|---|---|---|
| 10541 | Mahopac, NY | 0.9 mi |
| 10505 | Baldwin Place, NY | 2.2 mi |
| 10535 | Jefferson Valley, NY | 3.1 mi |
| 10527 | Granite Springs, NY | 3.6 mi |
| 10540 | Lincolndale, NY | 3.7 mi |
| 10579 | Putnam Valley, NY | 4 mi |
| 10588 | Shrub Oak, NY | 4.2 mi |
| 10589 | Somers, NY | 4.6 mi |
| 10501 | Amawalk, NY | 5.2 mi |
| 10519 | Croton Falls, NY | 5.6 mi |
| 10547 | Mohegan Lake, NY | 5.9 mi |
| 10578 | Purdys, NY | 6 mi |
Questions about 10542
What is the ZIP+4 code for 10542?
10542 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 10542, you need to look up a specific street address to get them.
What city is 10542?
10542 is assigned to Mahopac Falls, New York, in Putnam 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.