ZIP Code 18851 — Warren Center, PA
18851 is a standard (street delivery) ZIP code serving Warren Center, 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 18851 at a glance
| ZIP code | 18851 |
|---|---|
| Primary city | Warren Center |
| State | Pennsylvania (PA) |
| County | Bradford FIPS 42015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 615 |
| Coordinates | 41.936770, -76.179920 |
How ZIP+4 works in 18851
The four digits after the hyphen encode a delivery segment inside 18851. 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 18851 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 18851.
| ZIP | City | Distance |
|---|---|---|
| 18830 | Little Meadows, PA | 3.8 mi |
| 18837 | Rome, PA | 5.8 mi |
| 18829 | Le Raysville, PA | 6.7 mi |
| 18818 | Friendsville, PA | 6.9 mi |
| 13732 | Apalachin, NY | 7.4 mi |
| 18845 | Stevensville, PA | 10.1 mi |
| 18828 | Lawton, PA | 10.3 mi |
| 13850 | Vestal, NY | 11 mi |
| 13812 | Nichols, NY | 11 mi |
| 18812 | Brackney, PA | 11.1 mi |
| 13827 | Owego, NY | 12.6 mi |
| 18854 | Wysox, PA | 13.3 mi |
Questions about 18851
What is the ZIP+4 code for 18851?
18851 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 18851, you need to look up a specific street address to get them.
What city is 18851?
18851 is assigned to Warren Center, 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.