ZIP Code 17878 — Stillwater, PA
17878 is a standard (street delivery) ZIP code serving Stillwater, Pennsylvania, in Columbia 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 17878 at a glance
| ZIP code | 17878 |
|---|---|
| Primary city | Stillwater |
| State | Pennsylvania (PA) |
| County | Columbia FIPS 42037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,488 |
| Coordinates | 41.172100, -76.323640 |
How ZIP+4 works in 17878
The four digits after the hyphen encode a delivery segment inside 17878. 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 17878 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 17878.
| ZIP | City | Distance |
|---|---|---|
| 18622 | Huntington Mills, PA | 3.3 mi |
| 17859 | Orangeville, PA | 5.2 mi |
| 18655 | Shickshinny, PA | 6.7 mi |
| 18603 | Berwick, PA | 7.2 mi |
| 17814 | Benton, PA | 7.2 mi |
| 18631 | Mifflinville, PA | 9.8 mi |
| 17846 | Millville, PA | 10.2 mi |
| 18635 | Nescopeck, PA | 11.6 mi |
| 17815 | Bloomsburg, PA | 11.7 mi |
| 18656 | Sweet Valley, PA | 12.4 mi |
| 17774 | Unityville, PA | 12.5 mi |
| 18617 | Glen Lyon, PA | 12.8 mi |
Questions about 17878
What is the ZIP+4 code for 17878?
17878 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 17878, you need to look up a specific street address to get them.
What city is 17878?
17878 is assigned to Stillwater, Pennsylvania, in Columbia 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.