ZIP Code 80643 — Keenesburg, CO
80643 is a standard (street delivery) ZIP code serving Keenesburg, 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 80643 at a glance
| ZIP code | 80643 |
|---|---|
| Primary city | Keenesburg |
| State | Colorado (CO) |
| County | Weld FIPS 08123 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 5,119 |
| Coordinates | 40.111860, -104.471640 |
How ZIP+4 works in 80643
The four digits after the hyphen encode a delivery segment inside 80643. 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 80643 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 80643.
| ZIP | City | Distance |
|---|---|---|
| 80642 | Hudson, CO | 8.6 mi |
| 80652 | Roggen, CO | 10.4 mi |
| 80645 | La Salle, CO | 15.1 mi |
| 80644 | Kersey, CO | 15.6 mi |
| 80603 | Brighton, CO | 16.9 mi |
| 80621 | Fort Lupton, CO | 17.2 mi |
| 80651 | Platteville, CO | 20 mi |
| 80623 | Gilcrest, CO | 20.3 mi |
| 80601 | Brighton, CO | 20.5 mi |
| 80654 | Wiggins, CO | 20.9 mi |
| 80249 | Denver, CO | 21.6 mi |
| 80620 | Evans, CO | 22.1 mi |
Questions about 80643
What is the ZIP+4 code for 80643?
80643 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 80643, you need to look up a specific street address to get them.
What city is 80643?
80643 is assigned to Keenesburg, 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.