ZIP Code 80520 — Firestone, CO
80520 is a standard (street delivery) ZIP code serving Firestone, Colorado, in Weld 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 80520 at a glance
| ZIP code | 80520 |
|---|---|
| Primary city | Firestone |
| State | Colorado (CO) |
| County | Weld FIPS 08123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,140 |
| Coordinates | 40.113870, -104.933470 |
How ZIP+4 works in 80520
The four digits after the hyphen encode a delivery segment inside 80520. 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 80520 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 80520.
| ZIP | City | Distance |
|---|---|---|
| 80530 | Frederick, CO | 1 mi |
| 80514 | Dacono, CO | 3.1 mi |
| 80516 | Erie, CO | 6.1 mi |
| 80504 | Longmont, CO | 6.2 mi |
| 80621 | Fort Lupton, CO | 7.1 mi |
| 80542 | Mead, CO | 9 mi |
| 80501 | Longmont, CO | 9.6 mi |
| 80023 | Broomfield, CO | 10.5 mi |
| 80602 | Brighton, CO | 10.5 mi |
| 80651 | Platteville, CO | 10.6 mi |
| 80026 | Lafayette, CO | 11.2 mi |
| 80601 | Brighton, CO | 12.4 mi |
Questions about 80520
What is the ZIP+4 code for 80520?
80520 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 80520, you need to look up a specific street address to get them.
What city is 80520?
80520 is assigned to Firestone, Colorado, in Weld 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.