ZIP Code 81637 — Gypsum, CO
81637 is a standard (street delivery) ZIP code serving Gypsum, Colorado, in Garfield 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 81637 at a glance
| ZIP code | 81637 |
|---|---|
| Primary city | Gypsum |
| State | Colorado (CO) |
| County | Garfield FIPS 08045 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 10,744 |
| Coordinates | 39.771620, -107.100650 |
How ZIP+4 works in 81637
The four digits after the hyphen encode a delivery segment inside 81637. 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 81637 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 81637.
| ZIP | City | Distance |
|---|---|---|
| 80426 | Burns, CO | 9.4 mi |
| 81601 | Glenwood Springs, CO | 17.2 mi |
| 81631 | Eagle, CO | 20 mi |
| 80479 | Toponas, CO | 21.3 mi |
| 81655 | Wolcott, CO | 22.5 mi |
| 80463 | Mccoy, CO | 23 mi |
| 80483 | Yampa, CO | 26.2 mi |
| 81647 | New Castle, CO | 26.6 mi |
| 81632 | Edwards, CO | 28 mi |
| 80423 | Bond, CO | 29.5 mi |
| 81621 | Basalt, CO | 29.6 mi |
| 80469 | Phippsburg, CO | 31.4 mi |
Questions about 81637
What is the ZIP+4 code for 81637?
81637 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 81637, you need to look up a specific street address to get them.
What city is 81637?
81637 is assigned to Gypsum, Colorado, in Garfield 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.