ZIP Code 16420 — Grand Valley, PA
16420 is a standard (street delivery) ZIP code serving Grand Valley, Pennsylvania, in Warren 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 16420 at a glance
| ZIP code | 16420 |
|---|---|
| Primary city | Grand Valley |
| State | Pennsylvania (PA) |
| County | Warren FIPS 42123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 515 |
| Coordinates | 41.694810, -79.545440 |
How ZIP+4 works in 16420
The four digits after the hyphen encode a delivery segment inside 16420. 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 16420 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 16420.
| ZIP | City | Distance |
|---|---|---|
| 16351 | Tidioute, PA | 9 mi |
| 16341 | Pleasantville, PA | 9.1 mi |
| 16434 | Spartansburg, PA | 9.3 mi |
| 16340 | Pittsfield, PA | 9.7 mi |
| 16328 | Hydetown, PA | 9.8 mi |
| 16416 | Garland, PA | 9.8 mi |
| 16354 | Titusville, PA | 10 mi |
| 16370 | West Hickory, PA | 10.2 mi |
| 16322 | Endeavor, PA | 10.3 mi |
| 16436 | Spring Creek, PA | 11.4 mi |
| 16321 | East Hickory, PA | 11.5 mi |
| 16404 | Centerville, PA | 12.8 mi |
Questions about 16420
What is the ZIP+4 code for 16420?
16420 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 16420, you need to look up a specific street address to get them.
What city is 16420?
16420 is assigned to Grand Valley, Pennsylvania, in Warren 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.