ZIP Code 85643 — Willcox, AZ
85643 is a standard (street delivery) ZIP code serving Willcox, Arizona, in Graham 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 85643 at a glance
| ZIP code | 85643 |
|---|---|
| Primary city | Willcox |
| State | Arizona (AZ) |
| County | Graham FIPS 04009 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Phoenix |
| Population | 8,476 |
| Coordinates | 32.437570, -109.985210 |
How ZIP+4 works in 85643
The four digits after the hyphen encode a delivery segment inside 85643. 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 85643 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 85643.
| ZIP | City | Distance |
|---|---|---|
| 85609 | Dragoon, AZ | 26.3 mi |
| 85552 | Thatcher, AZ | 28.4 mi |
| 85606 | Cochise, AZ | 29.3 mi |
| 85602 | Benson, AZ | 29.7 mi |
| 85546 | Safford, AZ | 30.4 mi |
| 85605 | Bowie, AZ | 31.2 mi |
| 85551 | Solomon, AZ | 31.8 mi |
| 85531 | Central, AZ | 32.3 mi |
| 85627 | Pomerene, AZ | 33.4 mi |
| 85631 | San Manuel, AZ | 35.1 mi |
Questions about 85643
What is the ZIP+4 code for 85643?
85643 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 85643, you need to look up a specific street address to get them.
What city is 85643?
85643 is assigned to Willcox, Arizona, in Graham 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.