ZIP Code 18331 — Gilbert, PA
18331 is a standard (street delivery) ZIP code serving Gilbert, Pennsylvania, in Monroe 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 18331 at a glance
| ZIP code | 18331 |
|---|---|
| Primary city | Gilbert |
| State | Pennsylvania (PA) |
| County | Monroe FIPS 42089 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 655 |
| Coordinates | 40.908780, -75.440760 |
How ZIP+4 works in 18331
The four digits after the hyphen encode a delivery segment inside 18331. 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 18331 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 18331.
| ZIP | City | Distance |
|---|---|---|
| 18322 | Brodheadsville, PA | 2.5 mi |
| 18333 | Kresgeville, PA | 2.7 mi |
| 18058 | Kunkletown, PA | 2.9 mi |
| 18353 | Saylorsburg, PA | 3.8 mi |
| 18330 | Effort, PA | 3.9 mi |
| 18354 | Sciota, PA | 6 mi |
| 18038 | Danielsville, PA | 8.1 mi |
| 18091 | Wind Gap, PA | 8.4 mi |
| 18071 | Palmerton, PA | 9 mi |
| 18360 | Stroudsburg, PA | 9.2 mi |
| 18014 | Bath, PA | 10 mi |
| 18210 | Albrightsville, PA | 10.1 mi |
Questions about 18331
What is the ZIP+4 code for 18331?
18331 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 18331, you need to look up a specific street address to get them.
What city is 18331?
18331 is assigned to Gilbert, Pennsylvania, in Monroe 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.