ZIP Code 16001 — Butler, PA
16001 is a standard (street delivery) ZIP code serving Butler, Pennsylvania, in Butler 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 16001 at a glance
| ZIP code | 16001 |
|---|---|
| Primary city | Butler |
| State | Pennsylvania (PA) |
| County | Butler FIPS 42019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 39,234 |
| Coordinates | 40.910490, -79.943760 |
How ZIP+4 works in 16001
The four digits after the hyphen encode a delivery segment inside 16001. 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 16001 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.
Other ZIP codes in Butler
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 16001.
| ZIP | City | Distance |
|---|---|---|
| 16045 | Lyndora, PA | 4.2 mi |
| 16029 | East Butler, PA | 5.5 mi |
| 16052 | Prospect, PA | 6.2 mi |
| 16053 | Renfrew, PA | 7.1 mi |
| 16027 | Connoquenessing, PA | 7.4 mi |
| 16061 | West Sunbury, PA | 7.4 mi |
| 16002 | Butler, PA | 8 mi |
| 16033 | Evans City, PA | 9.7 mi |
| 16025 | Chicora, PA | 9.9 mi |
| 16037 | Harmony, PA | 10.3 mi |
| 16057 | Slippery Rock, PA | 10.4 mi |
| 16051 | Portersville, PA | 10.6 mi |
Questions about 16001
What is the ZIP+4 code for 16001?
16001 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 16001, you need to look up a specific street address to get them.
What city is 16001?
16001 is assigned to Butler, Pennsylvania, in Butler 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.