ZIP Code 80103 — Byers, CO
80103 is a standard (street delivery) ZIP code serving Byers, Colorado, in Adams 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 80103 at a glance
| ZIP code | 80103 |
|---|---|
| Primary city | Byers |
| State | Colorado (CO) |
| County | Adams FIPS 08001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 3,215 |
| Coordinates | 39.780350, -104.095760 |
How ZIP+4 works in 80103
The four digits after the hyphen encode a delivery segment inside 80103. 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 80103 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 80103.
| ZIP | City | Distance |
|---|---|---|
| 80136 | Strasburg, CO | 10.8 mi |
| 80105 | Deer Trail, CO | 12.8 mi |
| 80102 | Bennett, CO | 18.5 mi |
| 80654 | Wiggins, CO | 24.5 mi |
| 80652 | Roggen, CO | 24.7 mi |
| 80101 | Agate, CO | 25.6 mi |
| 80137 | Watkins, CO | 26.8 mi |
| 80757 | Woodrow, CO | 27.1 mi |
| 80701 | Fort Morgan, CO | 28.8 mi |
| 80643 | Keenesburg, CO | 30.3 mi |
| 80018 | Aurora, CO | 31.6 mi |
| 80249 | Denver, CO | 32.1 mi |
Questions about 80103
What is the ZIP+4 code for 80103?
80103 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 80103, you need to look up a specific street address to get them.
What city is 80103?
80103 is assigned to Byers, Colorado, in Adams 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.