ZIP Code 17237 — Mont Alto, PA
17237 is a standard (street delivery) ZIP code serving Mont Alto, Pennsylvania, in Franklin 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 17237 at a glance
| ZIP code | 17237 |
|---|---|
| Primary city | Mont Alto |
| State | Pennsylvania (PA) |
| County | Franklin FIPS 42055 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,759 |
| Coordinates | 39.837050, -77.540910 |
How ZIP+4 works in 17237
The four digits after the hyphen encode a delivery segment inside 17237. 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 17237 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 17237.
| ZIP | City | Distance |
|---|---|---|
| 17261 | South Mountain, PA | 2.2 mi |
| 17247 | Quincy, PA | 3.3 mi |
| 17268 | Waynesboro, PA | 4.7 mi |
| 17222 | Fayetteville, PA | 5 mi |
| 17250 | Rouzerville, PA | 7 mi |
| 17214 | Blue Ridge Summit, PA | 7.2 mi |
| 17235 | Marion, PA | 8.4 mi |
| 17353 | Orrtanna, PA | 8.9 mi |
| 17202 | Chambersburg, PA | 9.2 mi |
| 21719 | Cascade, MD | 9.4 mi |
| 17254 | Scotland, PA | 9.4 mi |
| 17320 | Fairfield, PA | 9.4 mi |
Questions about 17237
What is the ZIP+4 code for 17237?
17237 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 17237, you need to look up a specific street address to get them.
What city is 17237?
17237 is assigned to Mont Alto, Pennsylvania, in Franklin 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.