ZIP Code 81090 — Walsh, CO
81090 is a standard (street delivery) ZIP code serving Walsh, Colorado, in Baca 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 81090 at a glance
| ZIP code | 81090 |
|---|---|
| Primary city | Walsh |
| State | Colorado (CO) |
| County | Baca FIPS 08009 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 829 |
| Coordinates | 37.363110, -102.224340 |
How ZIP+4 works in 81090
The four digits after the hyphen encode a delivery segment inside 81090. 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 81090 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 81090.
| ZIP | City | Distance |
|---|---|---|
| 81087 | Vilas, CO | 10.5 mi |
| 67862 | Manter, KS | 16.9 mi |
| 81084 | Two Buttes, CO | 17.9 mi |
| 67953 | Richfield, KS | 22 mi |
| 81029 | Campo, CO | 23.6 mi |
| 81073 | Springfield, CO | 27.2 mi |
| 67950 | Elkhart, KS | 28.5 mi |
| 67855 | Johnson, KS | 31.7 mi |
| 81041 | Granada, CO | 34.3 mi |
| 73946 | Kenton, OK | 44.3 mi |
Questions about 81090
What is the ZIP+4 code for 81090?
81090 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 81090, you need to look up a specific street address to get them.
What city is 81090?
81090 is assigned to Walsh, Colorado, in Baca 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.