ZIP Code 81631 — Eagle, CO
81631 is a standard (street delivery) ZIP code serving Eagle, Colorado, in Eagle 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 81631 at a glance
| ZIP code | 81631 |
|---|---|
| Primary city | Eagle |
| State | Colorado (CO) |
| County | Eagle FIPS 08037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 8,958 |
| Coordinates | 39.631160, -106.771360 |
How ZIP+4 works in 81631
The four digits after the hyphen encode a delivery segment inside 81631. 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 81631 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 81631.
| ZIP | City | Distance |
|---|---|---|
| 81632 | Edwards, CO | 8.5 mi |
| 81655 | Wolcott, CO | 9.4 mi |
| 81620 | Avon, CO | 14.2 mi |
| 81621 | Basalt, CO | 18.3 mi |
| 80423 | Bond, CO | 18.9 mi |
| 81645 | Minturn, CO | 19.3 mi |
| 81637 | Gypsum, CO | 20 mi |
| 80426 | Burns, CO | 20.2 mi |
| 80463 | Mccoy, CO | 22.4 mi |
| 81657 | Vail, CO | 23.7 mi |
| 81642 | Meredith, CO | 24.2 mi |
| 81656 | Woody Creek, CO | 24.3 mi |
Questions about 81631
What is the ZIP+4 code for 81631?
81631 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 81631, you need to look up a specific street address to get them.
What city is 81631?
81631 is assigned to Eagle, Colorado, in Eagle 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.