ZIP Code 85618 — Mammoth, AZ
85618 is a standard (street delivery) ZIP code serving Mammoth, 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 85618 at a glance
| ZIP code | 85618 |
|---|---|
| Primary city | Mammoth |
| State | Arizona (AZ) |
| County | Pinal FIPS 04021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Phoenix |
| Population | 1,550 |
| Coordinates | 32.776310, -110.694330 |
How ZIP+4 works in 85618
The four digits after the hyphen encode a delivery segment inside 85618. 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 85618 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 85618.
| ZIP | City | Distance |
|---|---|---|
| 85623 | Oracle, AZ | 9.9 mi |
| 85192 | Winkelman, AZ | 12.9 mi |
| 85631 | San Manuel, AZ | 15.5 mi |
| 85135 | Hayden, AZ | 16.2 mi |
| 85739 | Tucson, AZ | 21.4 mi |
| 85619 | Mount Lemmon, AZ | 26.4 mi |
| 85755 | Tucson, AZ | 27 mi |
| 85137 | Kearny, AZ | 28.6 mi |
| 85737 | Tucson, AZ | 29 mi |
| 85132 | Florence, AZ | 30.6 mi |
| 85658 | Marana, AZ | 31 mi |
| 85742 | Tucson, AZ | 33.8 mi |
Questions about 85618
What is the ZIP+4 code for 85618?
85618 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 85618, you need to look up a specific street address to get them.
What city is 85618?
85618 is assigned to Mammoth, 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.