ZIP Code 80534 — Johnstown, CO
80534 is a standard (street delivery) ZIP code serving Johnstown, 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 80534 at a glance
| ZIP code | 80534 |
|---|---|
| Primary city | Johnstown |
| State | Colorado (CO) |
| County | Weld FIPS 08123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 20,502 |
| Coordinates | 40.331920, -104.935220 |
How ZIP+4 works in 80534
The four digits after the hyphen encode a delivery segment inside 80534. 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 80534 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 80534.
| ZIP | City | Distance |
|---|---|---|
| 80543 | Milliken, CO | 4.4 mi |
| 80542 | Mead, CO | 7.5 mi |
| 80623 | Gilcrest, CO | 8.7 mi |
| 80634 | Greeley, CO | 8.9 mi |
| 80651 | Platteville, CO | 9.1 mi |
| 80513 | Berthoud, CO | 9.4 mi |
| 80550 | Windsor, CO | 10.5 mi |
| 80528 | Fort Collins, CO | 11.7 mi |
| 80620 | Evans, CO | 12 mi |
| 80504 | Longmont, CO | 12.5 mi |
| 80547 | Timnath, CO | 13.7 mi |
| 80546 | Severance, CO | 14 mi |
Questions about 80534
What is the ZIP+4 code for 80534?
80534 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 80534, you need to look up a specific street address to get them.
What city is 80534?
80534 is assigned to Johnstown, 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.