ZIP Code 80428 — Clark, CO
80428 is a standard (street delivery) ZIP code serving Clark, Colorado, in Routt 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 80428 at a glance
| ZIP code | 80428 |
|---|---|
| Primary city | Clark |
| State | Colorado (CO) |
| County | Routt FIPS 08107 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 720 |
| Coordinates | 40.853260, -106.913730 |
How ZIP+4 works in 80428
The four digits after the hyphen encode a delivery segment inside 80428. 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 80428 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 80428.
| ZIP | City | Distance |
|---|---|---|
| 81653 | Slater, CO | 16.7 mi |
| 80487 | Steamboat Springs, CO | 18.3 mi |
| 82325 | Encampment, WY | 22.3 mi |
| 82332 | Savery, WY | 24.9 mi |
| 81639 | Hayden, CO | 28.4 mi |
| 80480 | Walden, CO | 32.4 mi |
| 80430 | Coalmont, CO | 34 mi |
Questions about 80428
What is the ZIP+4 code for 80428?
80428 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 80428, you need to look up a specific street address to get them.
What city is 80428?
80428 is assigned to Clark, Colorado, in Routt 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.