ZIP Code 81434 — Somerset, CO
81434 is a standard (street delivery) ZIP code serving Somerset, Colorado, in Gunnison 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 81434 at a glance
| ZIP code | 81434 |
|---|---|
| Primary city | Somerset |
| State | Colorado (CO) |
| County | Gunnison FIPS 08051 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 127 |
| Coordinates | 38.953840, -107.359540 |
How ZIP+4 works in 81434
The four digits after the hyphen encode a delivery segment inside 81434. 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 81434 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 81434.
| ZIP | City | Distance |
|---|---|---|
| 81428 | Paonia, CO | 12.9 mi |
| 81225 | Crested Butte, CO | 19 mi |
| 81623 | Carbondale, CO | 21.7 mi |
| 81419 | Hotchkiss, CO | 21.8 mi |
| 81224 | Crested Butte, CO | 24.7 mi |
| 81654 | Snowmass, CO | 25.4 mi |
| 81415 | Crawford, CO | 26.3 mi |
| 81615 | Snowmass Village, CO | 28.7 mi |
| 81413 | Cedaredge, CO | 29.5 mi |
| 81612 | Aspen, CO | 29.5 mi |
| 81624 | Collbran, CO | 30 mi |
| 81401 | Montrose, CO | 37.9 mi |
Questions about 81434
What is the ZIP+4 code for 81434?
81434 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 81434, you need to look up a specific street address to get them.
What city is 81434?
81434 is assigned to Somerset, Colorado, in Gunnison 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.