ZIP Code 80721 — Amherst, CO
80721 is a standard (street delivery) ZIP code serving Amherst, Colorado, in Phillips 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 80721 at a glance
| ZIP code | 80721 |
|---|---|
| Primary city | Amherst |
| State | Colorado (CO) |
| County | Phillips FIPS 08095 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 257 |
| Coordinates | 40.688210, -102.152970 |
How ZIP+4 works in 80721
The four digits after the hyphen encode a delivery segment inside 80721. 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 80721 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 80721.
| ZIP | City | Distance |
|---|---|---|
| 69168 | Venango, NE | 9.9 mi |
| 80734 | Holyoke, CO | 13.4 mi |
| 80737 | Julesburg, CO | 14.1 mi |
| 80746 | Paoli, CO | 16.9 mi |
| 80744 | Ovid, CO | 17.6 mi |
| 69023 | Champion, NE | 19.6 mi |
| 69140 | Grant, NE | 22.5 mi |
| 80749 | Sedgwick, CO | 24.6 mi |
| 80731 | Haxtun, CO | 24.7 mi |
| 69033 | Imperial, NE | 25.8 mi |
| 69122 | Big Springs, NE | 28.4 mi |
| 69127 | Brule, NE | 31.3 mi |
Questions about 80721
What is the ZIP+4 code for 80721?
80721 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 80721, you need to look up a specific street address to get them.
What city is 80721?
80721 is assigned to Amherst, Colorado, in Phillips 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.