ZIP Code 85371 — Poston, AZ
85371 is a standard (street delivery) ZIP code serving Poston, Arizona, in La Paz 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 85371 at a glance
| ZIP code | 85371 |
|---|---|
| Primary city | Poston |
| State | Arizona (AZ) |
| County | La Paz FIPS 04012 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Phoenix |
| Population | 111 |
| Coordinates | 33.967320, -114.390050 |
How ZIP+4 works in 85371
The four digits after the hyphen encode a delivery segment inside 85371. 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 85371 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 85371.
| ZIP | City | Distance |
|---|---|---|
| 85344 | Parker, AZ | 9.1 mi |
| 92242 | Earp, CA | 16.1 mi |
| 92225 | Blythe, CA | 23.1 mi |
| 85334 | Ehrenberg, AZ | 25 mi |
| 92267 | Parker Dam, CA | 25.2 mi |
| 85346 | Quartzsite, AZ | 28 mi |
| 92280 | Vidal, CA | 28.7 mi |
| 85325 | Bouse, AZ | 31.3 mi |
| 86406 | Lake Havasu City, AZ | 34.9 mi |
Questions about 85371
What is the ZIP+4 code for 85371?
85371 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 85371, you need to look up a specific street address to get them.
What city is 85371?
85371 is assigned to Poston, Arizona, in La Paz 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.