ZIP Code 85637 — Sonoita, AZ
85637 is a standard (street delivery) ZIP code serving Sonoita, Arizona, in Santa Cruz 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 85637 at a glance
| ZIP code | 85637 |
|---|---|
| Primary city | Sonoita |
| State | Arizona (AZ) |
| County | Santa Cruz FIPS 04023 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Phoenix |
| Population | 1,105 |
| Coordinates | 31.721080, -110.692580 |
How ZIP+4 works in 85637
The four digits after the hyphen encode a delivery segment inside 85637. 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 85637 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 85637.
| ZIP | City | Distance |
|---|---|---|
| 85611 | Elgin, AZ | 11.8 mi |
| 85624 | Patagonia, AZ | 14.1 mi |
| 85614 | Green Valley, AZ | 15.3 mi |
| 85641 | Vail, AZ | 20.9 mi |
| 85613 | Fort Huachuca, AZ | 21.5 mi |
| 85616 | Huachuca City, AZ | 21.8 mi |
| 85646 | Tubac, AZ | 22.2 mi |
| 85629 | Sahuarita, AZ | 23.1 mi |
| 85640 | Tumacacori, AZ | 23.2 mi |
| 85648 | Rio Rico, AZ | 23.4 mi |
| 85622 | Green Valley, AZ | 24.1 mi |
| 85734 | Tucson, AZ | 26 mi |
Questions about 85637
What is the ZIP+4 code for 85637?
85637 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 85637, you need to look up a specific street address to get them.
What city is 85637?
85637 is assigned to Sonoita, Arizona, in Santa Cruz 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.