ZIP Code 85145 — Red Rock, AZ
85145 is a standard (street delivery) ZIP code serving Red Rock, Arizona, in Pinal 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 85145 at a glance
| ZIP code | 85145 |
|---|---|
| Primary city | Red Rock |
| State | Arizona (AZ) |
| County | Pinal FIPS 04021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Phoenix |
| Population | 3,277 |
| Coordinates | 32.543220, -111.394150 |
How ZIP+4 works in 85145
The four digits after the hyphen encode a delivery segment inside 85145. 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 85145 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 85145.
| ZIP | City | Distance |
|---|---|---|
| 85141 | Picacho, AZ | 7.4 mi |
| 85653 | Marana, AZ | 10.6 mi |
| 85131 | Eloy, AZ | 13.1 mi |
| 85658 | Marana, AZ | 15.1 mi |
| 85654 | Rillito, AZ | 16.5 mi |
| 85123 | Arizona City, AZ | 20.2 mi |
| 85743 | Tucson, AZ | 20.4 mi |
| 85742 | Tucson, AZ | 22.6 mi |
| 85739 | Tucson, AZ | 23 mi |
| 85755 | Tucson, AZ | 24.6 mi |
| 85741 | Tucson, AZ | 25 mi |
| 85737 | Tucson, AZ | 27.5 mi |
Questions about 85145
What is the ZIP+4 code for 85145?
85145 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 85145, you need to look up a specific street address to get them.
What city is 85145?
85145 is assigned to Red Rock, Arizona, in Pinal 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.