ZIP Code 80510 — Allenspark, CO
80510 is a standard (street delivery) ZIP code serving Allenspark, Colorado, in Boulder 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 80510 at a glance
| ZIP code | 80510 |
|---|---|
| Primary city | Allenspark |
| State | Colorado (CO) |
| County | Boulder FIPS 08013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 663 |
| Coordinates | 40.209640, -105.578780 |
How ZIP+4 works in 80510
The four digits after the hyphen encode a delivery segment inside 80510. 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 80510 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 80510.
| ZIP | City | Distance |
|---|---|---|
| 80481 | Ward, CO | 7.9 mi |
| 80540 | Lyons, CO | 9.9 mi |
| 80455 | Jamestown, CO | 12 mi |
| 80517 | Estes Park, CO | 13.1 mi |
| 80447 | Grand Lake, CO | 14.1 mi |
| 80466 | Nederland, CO | 15.2 mi |
| 80302 | Boulder, CO | 17.1 mi |
| 80304 | Boulder, CO | 19 mi |
| 80446 | Granby, CO | 19.1 mi |
| 80478 | Tabernash, CO | 19.5 mi |
| 80532 | Glen Haven, CO | 19.5 mi |
| 80474 | Rollinsville, CO | 19.8 mi |
Questions about 80510
What is the ZIP+4 code for 80510?
80510 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 80510, you need to look up a specific street address to get them.
What city is 80510?
80510 is assigned to Allenspark, Colorado, in Boulder 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.