ZIP Code 81251 — Twin Lakes, CO
81251 is a standard (street delivery) ZIP code serving Twin Lakes, Colorado, in Lake 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 81251 at a glance
| ZIP code | 81251 |
|---|---|
| Primary city | Twin Lakes |
| State | Colorado (CO) |
| County | Lake FIPS 08065 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 423 |
| Coordinates | 39.134820, -106.437230 |
How ZIP+4 works in 81251
The four digits after the hyphen encode a delivery segment inside 81251. 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 81251 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 81251.
| ZIP | City | Distance |
|---|---|---|
| 80461 | Leadville, CO | 10.8 mi |
| 81228 | Granite, CO | 11 mi |
| 81642 | Meredith, CO | 14.5 mi |
| 81611 | Aspen, CO | 16.7 mi |
| 81211 | Buena Vista, CO | 19.6 mi |
| 80440 | Fairplay, CO | 21.2 mi |
| 81656 | Woody Creek, CO | 21.2 mi |
| 81612 | Aspen, CO | 21.5 mi |
| 80420 | Alma, CO | 21.7 mi |
| 81645 | Minturn, CO | 23.6 mi |
| 81649 | Red Cliff, CO | 23.6 mi |
| 81210 | Almont, CO | 23.9 mi |
Questions about 81251
What is the ZIP+4 code for 81251?
81251 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 81251, you need to look up a specific street address to get them.
What city is 81251?
81251 is assigned to Twin Lakes, Colorado, in Lake 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.