ZIP Code 13621 — Chase Mills, NY
13621 is a standard (street delivery) ZIP code serving Chase Mills, 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 13621 at a glance
| ZIP code | 13621 |
|---|---|
| Primary city | Chase Mills |
| State | New York (NY) |
| County | St. Lawrence FIPS 36089 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 589 |
| Coordinates | 44.845200, -75.065960 |
How ZIP+4 works in 13621
The four digits after the hyphen encode a delivery segment inside 13621. 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 13621 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 13621.
| ZIP | City | Distance |
|---|---|---|
| 13694 | Waddington, NY | 4.9 mi |
| 13678 | Raymondville, NY | 4.9 mi |
| 13667 | Norfolk, NY | 5.1 mi |
| 13660 | Madrid, NY | 6.5 mi |
| 13668 | Norwood, NY | 7.3 mi |
| 13662 | Massena, NY | 10.6 mi |
| 13658 | Lisbon, NY | 12.7 mi |
| 13699 | Potsdam, NY | 12.9 mi |
| 13696 | West Stockholm, NY | 13 mi |
| 13697 | Winthrop, NY | 14.3 mi |
| 13676 | Potsdam, NY | 15.3 mi |
| 13613 | Brasher Falls, NY | 16 mi |
Questions about 13621
What is the ZIP+4 code for 13621?
13621 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 13621, you need to look up a specific street address to get them.
What city is 13621?
13621 is assigned to Chase Mills, 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.