ZIP Code 80420 — Alma, CO
80420 is a standard (street delivery) ZIP code serving Alma, Colorado, in Park 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 80420 at a glance
| ZIP code | 80420 |
|---|---|
| Primary city | Alma |
| State | Colorado (CO) |
| County | Park FIPS 08093 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,246 |
| Coordinates | 39.314510, -106.105530 |
How ZIP+4 works in 80420
The four digits after the hyphen encode a delivery segment inside 80420. 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 80420 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 80420.
| ZIP | City | Distance |
|---|---|---|
| 80461 | Leadville, CO | 11 mi |
| 80424 | Breckenridge, CO | 11.8 mi |
| 80440 | Fairplay, CO | 12.9 mi |
| 80443 | Frisco, CO | 13.3 mi |
| 81649 | Red Cliff, CO | 15.4 mi |
| 80432 | Como, CO | 16 mi |
| 81228 | Granite, CO | 21.4 mi |
| 81251 | Twin Lakes, CO | 21.6 mi |
| 80435 | Dillon, CO | 22 mi |
| 80456 | Jefferson, CO | 22.1 mi |
| 81645 | Minturn, CO | 22.3 mi |
| 81642 | Meredith, CO | 25.6 mi |
Questions about 80420
What is the ZIP+4 code for 80420?
80420 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 80420, you need to look up a specific street address to get them.
What city is 80420?
80420 is assigned to Alma, Colorado, in Park 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.