ZIP Code 81237 — Ohio City, CO
81237 is a standard (street delivery) ZIP code serving Ohio City, 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 81237 at a glance
| ZIP code | 81237 |
|---|---|
| Primary city | Ohio City |
| State | Colorado (CO) |
| County | Gunnison FIPS 08051 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 169 |
| Coordinates | 38.628420, -106.591080 |
How ZIP+4 works in 81237
The four digits after the hyphen encode a delivery segment inside 81237. 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 81237 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 81237.
| ZIP | City | Distance |
|---|---|---|
| 81241 | Pitkin, CO | 5.5 mi |
| 81239 | Parlin, CO | 6.4 mi |
| 81210 | Almont, CO | 13.3 mi |
| 81248 | Sargents, CO | 17 mi |
| 81227 | Monarch, CO | 17.1 mi |
| 81236 | Nathrop, CO | 18.7 mi |
| 81224 | Crested Butte, CO | 24.4 mi |
| 81230 | Gunnison, CO | 26.1 mi |
| 81211 | Buena Vista, CO | 26.4 mi |
| 81201 | Salida, CO | 28 mi |
| 81242 | Poncha Springs, CO | 30 mi |
| 81225 | Crested Butte, CO | 31.1 mi |
Questions about 81237
What is the ZIP+4 code for 81237?
81237 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 81237, you need to look up a specific street address to get them.
What city is 81237?
81237 is assigned to Ohio City, 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.