ZIP Code 13666 — Newton Falls, NY
13666 is a standard (street delivery) ZIP code serving Newton Falls, New York, in St. Lawrence 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 13666 at a glance
| ZIP code | 13666 |
|---|---|
| Primary city | Newton Falls |
| State | New York (NY) |
| County | St. Lawrence FIPS 36089 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 234 |
| Coordinates | 44.214040, -74.955570 |
How ZIP+4 works in 13666
The four digits after the hyphen encode a delivery segment inside 13666. 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 13666 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 13666.
| ZIP | City | Distance |
|---|---|---|
| 12927 | Cranberry Lake, NY | 6.9 mi |
| 13690 | Star Lake, NY | 6.9 mi |
| 13695 | Wanakena, NY | 7.6 mi |
| 13670 | Oswegatchie, NY | 8.2 mi |
| 13639 | Fine, NY | 9.8 mi |
| 13684 | Russell, NY | 11.4 mi |
| 12922 | Childwold, NY | 11.9 mi |
| 13635 | Edwards, NY | 16.2 mi |
| 13687 | South Colton, NY | 17.3 mi |
| 13648 | Harrisville, NY | 17.6 mi |
| 12973 | Piercefield, NY | 19 mi |
| 13652 | Hermon, NY | 19.9 mi |
Questions about 13666
What is the ZIP+4 code for 13666?
13666 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 13666, you need to look up a specific street address to get them.
What city is 13666?
13666 is assigned to Newton Falls, New York, in St. Lawrence 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.