ZIP Code 18820 — Gibson, PA
18820 is a standard (street delivery) ZIP code serving Gibson, Pennsylvania, in Susquehanna 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 18820 at a glance
| ZIP code | 18820 |
|---|---|
| Primary city | Gibson |
| State | Pennsylvania (PA) |
| County | Susquehanna FIPS 42115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 36 |
| Coordinates | 41.777900, -75.650290 |
How ZIP+4 works in 18820
The four digits after the hyphen encode a delivery segment inside 18820. 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 18820 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 18820.
| ZIP | City | Distance |
|---|---|---|
| 18823 | Harford, PA | 2.1 mi |
| 18842 | South Gibson, PA | 2.3 mi |
| 18825 | Jackson, PA | 4.1 mi |
| 18826 | Kingsley, PA | 5.1 mi |
| 18834 | New Milford, PA | 5.4 mi |
| 18470 | Union Dale, PA | 6.7 mi |
| 18465 | Thompson, PA | 7.9 mi |
| 18441 | Lenoxville, PA | 8.3 mi |
| 18824 | Hop Bottom, PA | 8.6 mi |
| 18430 | Herrick Center, PA | 9.2 mi |
| 18446 | Nicholson, PA | 10.8 mi |
| 18413 | Clifford, PA | 10.8 mi |
Questions about 18820
What is the ZIP+4 code for 18820?
18820 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 18820, you need to look up a specific street address to get them.
What city is 18820?
18820 is assigned to Gibson, Pennsylvania, in Susquehanna 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.