ZIP Code 83643 — Mesa, ID
83643 is a standard (street delivery) ZIP code serving Mesa, Idaho, 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 83643 at a glance
| ZIP code | 83643 |
|---|---|
| Primary city | Mesa |
| State | Idaho (ID) |
| County | Adams FIPS 16003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Boise |
| Population | 166 |
| Coordinates | 44.629830, -116.454390 |
How ZIP+4 works in 83643
The four digits after the hyphen encode a delivery segment inside 83643. 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 83643 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 83643.
| ZIP | City | Distance |
|---|---|---|
| 83632 | Indian Valley, ID | 7.1 mi |
| 83612 | Council, ID | 15.3 mi |
| 83610 | Cambridge, ID | 16.9 mi |
| 83645 | Midvale, ID | 19.4 mi |
| 83615 | Donnelly, ID | 20.6 mi |
| 83657 | Ola, ID | 28.2 mi |
| 97840 | Oxbow, OR | 30.2 mi |
| 83672 | Weiser, ID | 30.7 mi |
Questions about 83643
What is the ZIP+4 code for 83643?
83643 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 83643, you need to look up a specific street address to get them.
What city is 83643?
83643 is assigned to Mesa, Idaho, 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.