ZIP Code 17320 — Fairfield, PA
17320 is a standard (street delivery) ZIP code serving Fairfield, Pennsylvania, in Adams 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 17320 at a glance
| ZIP code | 17320 |
|---|---|
| Primary city | Fairfield |
| State | Pennsylvania (PA) |
| County | Adams FIPS 42001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 8,124 |
| Coordinates | 39.769500, -77.387490 |
How ZIP+4 works in 17320
The four digits after the hyphen encode a delivery segment inside 17320. 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 17320 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 17320.
| ZIP | City | Distance |
|---|---|---|
| 17214 | Blue Ridge Summit, PA | 4.6 mi |
| 21727 | Emmitsburg, MD | 6.3 mi |
| 21719 | Cascade, MD | 7.4 mi |
| 17343 | Mcknightstown, PA | 7.5 mi |
| 17250 | Rouzerville, PA | 7.6 mi |
| 21780 | Sabillasville, MD | 7.7 mi |
| 17353 | Orrtanna, PA | 8.1 mi |
| 17261 | South Mountain, PA | 9.1 mi |
| 17325 | Gettysburg, PA | 9.4 mi |
| 17237 | Mont Alto, PA | 9.4 mi |
| 17268 | Waynesboro, PA | 9.9 mi |
| 17247 | Quincy, PA | 10.4 mi |
Questions about 17320
What is the ZIP+4 code for 17320?
17320 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 17320, you need to look up a specific street address to get them.
What city is 17320?
17320 is assigned to Fairfield, Pennsylvania, in Adams 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.