ZIP Code 16921 — Gaines, PA
16921 is a standard (street delivery) ZIP code serving Gaines, Pennsylvania, in Tioga 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 16921 at a glance
| ZIP code | 16921 |
|---|---|
| Primary city | Gaines |
| State | Pennsylvania (PA) |
| County | Tioga FIPS 42117 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 622 |
| Coordinates | 41.696140, -77.546540 |
How ZIP+4 works in 16921
The four digits after the hyphen encode a delivery segment inside 16921. 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 16921 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 16921.
| ZIP | City | Distance |
|---|---|---|
| 16922 | Galeton, PA | 8.1 mi |
| 16943 | Sabinsville, PA | 10.6 mi |
| 17727 | Cedar Run, PA | 11.4 mi |
| 16901 | Wellsboro, PA | 12 mi |
| 16938 | Morris, PA | 13.6 mi |
| 17769 | Slate Run, PA | 13.8 mi |
| 16950 | Westfield, PA | 14 mi |
| 16948 | Ulysses, PA | 15.3 mi |
| 16935 | Middlebury Center, PA | 16.6 mi |
| 17729 | Cross Fork, PA | 17 mi |
| 16928 | Knoxville, PA | 18.6 mi |
| 17723 | Cammal, PA | 18.9 mi |
Questions about 16921
What is the ZIP+4 code for 16921?
16921 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 16921, you need to look up a specific street address to get them.
What city is 16921?
16921 is assigned to Gaines, Pennsylvania, in Tioga 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.