ZIP Code 18850 — Ulster, PA
18850 is a standard (street delivery) ZIP code serving Ulster, Pennsylvania, in Bradford 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 18850 at a glance
| ZIP code | 18850 |
|---|---|
| Primary city | Ulster |
| State | Pennsylvania (PA) |
| County | Bradford FIPS 42015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,070 |
| Coordinates | 41.859160, -76.491260 |
How ZIP+4 works in 18850
The four digits after the hyphen encode a delivery segment inside 18850. 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 18850 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 18850.
| ZIP | City | Distance |
|---|---|---|
| 18810 | Athens, PA | 5.4 mi |
| 18831 | Milan, PA | 6.5 mi |
| 18817 | East Smithfield, PA | 6.7 mi |
| 18848 | Towanda, PA | 7.5 mi |
| 18814 | Burlington, PA | 7.8 mi |
| 18840 | Sayre, PA | 8.2 mi |
| 18854 | Wysox, PA | 8.3 mi |
| 18837 | Rome, PA | 11.1 mi |
| 18832 | Monroeton, PA | 13.1 mi |
| 14892 | Waverly, NY | 13.2 mi |
| 13812 | Nichols, NY | 13.7 mi |
| 16914 | Columbia Cross Roads, PA | 14.7 mi |
Questions about 18850
What is the ZIP+4 code for 18850?
18850 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 18850, you need to look up a specific street address to get them.
What city is 18850?
18850 is assigned to Ulster, Pennsylvania, in Bradford 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.