ZIP Code 82601 — Casper, WY
82601 is a standard (street delivery) ZIP code serving Casper, Wyoming, in Natrona 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 82601 at a glance
| ZIP code | 82601 |
|---|---|
| Primary city | Casper |
| State | Wyoming (WY) |
| County | Natrona FIPS 56025 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 26,721 |
| Coordinates | 43.065500, -106.346180 |
How ZIP+4 works in 82601
The four digits after the hyphen encode a delivery segment inside 82601. 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 82601 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.
Other ZIP codes in Casper
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 82601.
| ZIP | City | Distance |
|---|---|---|
| 82644 | Mills, WY | 15.4 mi |
| 82636 | Evansville, WY | 18.9 mi |
| 82604 | Casper, WY | 20.9 mi |
| 82609 | Casper, WY | 21.4 mi |
| 82646 | Natrona, WY | 23.8 mi |
| 82635 | Edgerton, WY | 25.4 mi |
| 82643 | Midwest, WY | 26.1 mi |
| 82637 | Glenrock, WY | 31.2 mi |
| 82640 | Linch, WY | 35.5 mi |
Questions about 82601
What is the ZIP+4 code for 82601?
82601 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 82601, you need to look up a specific street address to get them.
What city is 82601?
82601 is assigned to Casper, Wyoming, in Natrona 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.