ZIP Code 81091 — Weston, CO
81091 is a standard (street delivery) ZIP code serving Weston, Colorado, in Las Animas 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 81091 at a glance
| ZIP code | 81091 |
|---|---|
| Primary city | Weston |
| State | Colorado (CO) |
| County | Las Animas FIPS 08071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,120 |
| Coordinates | 37.148690, -104.977740 |
How ZIP+4 works in 81091
The four digits after the hyphen encode a delivery segment inside 81091. 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 81091 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 81091.
| ZIP | City | Distance |
|---|---|---|
| 81024 | Boncarbo, CO | 15.7 mi |
| 81126 | Chama, CO | 20.3 mi |
| 81152 | San Luis, CO | 23 mi |
| 81055 | La Veta, CO | 23.2 mi |
| 87512 | Amalia, NM | 27 mi |
| 81020 | Aguilar, CO | 27.8 mi |
| 81133 | Fort Garland, CO | 28.3 mi |
| 81082 | Trinidad, CO | 31.1 mi |
| 87524 | Costilla, NM | 33.2 mi |
| 81123 | Blanca, CO | 36.9 mi |
| 87556 | Questa, NM | 39.2 mi |
| 87558 | Red River, NM | 40.4 mi |
Questions about 81091
What is the ZIP+4 code for 81091?
81091 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 81091, you need to look up a specific street address to get them.
What city is 81091?
81091 is assigned to Weston, Colorado, in Las Animas 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.