ZIP Code 16405 — Columbus, PA
16405 is a standard (street delivery) ZIP code serving Columbus, 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 16405 at a glance
| ZIP code | 16405 |
|---|---|
| Primary city | Columbus |
| State | Pennsylvania (PA) |
| County | Warren FIPS 42123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 514 |
| Coordinates | 41.938000, -79.533500 |
How ZIP+4 works in 16405
The four digits after the hyphen encode a delivery segment inside 16405. 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 16405 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 16405.
| ZIP | City | Distance |
|---|---|---|
| 16402 | Bear Lake, PA | 3.3 mi |
| 16436 | Spring Creek, PA | 6 mi |
| 16407 | Corry, PA | 6.8 mi |
| 14767 | Panama, NY | 8 mi |
| 16416 | Garland, PA | 8.3 mi |
| 16350 | Sugar Grove, PA | 10.5 mi |
| 14724 | Clymer, NY | 10.6 mi |
| 16340 | Pittsfield, PA | 11.3 mi |
| 16312 | Chandlers Valley, PA | 11.8 mi |
| 14710 | Ashville, NY | 11.9 mi |
| 16434 | Spartansburg, PA | 12.1 mi |
| 16371 | Youngsville, PA | 12.1 mi |
Questions about 16405
What is the ZIP+4 code for 16405?
16405 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 16405, you need to look up a specific street address to get them.
What city is 16405?
16405 is assigned to Columbus, 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.