ZIP Code 83431 — Lewisville, ID
83431 is a standard (street delivery) ZIP code serving Lewisville, Idaho, in Jefferson 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 83431 at a glance
| ZIP code | 83431 |
|---|---|
| Primary city | Lewisville |
| State | Idaho (ID) |
| County | Jefferson FIPS 16051 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Boise |
| Population | 1,045 |
| Coordinates | 43.688080, -112.030120 |
How ZIP+4 works in 83431
The four digits after the hyphen encode a delivery segment inside 83431. 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 83431 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 83431.
| ZIP | City | Distance |
|---|---|---|
| 83434 | Menan, ID | 4.8 mi |
| 83454 | Ucon, ID | 7.4 mi |
| 83444 | Roberts, ID | 10.7 mi |
| 83442 | Rigby, ID | 11 mi |
| 83402 | Idaho Falls, ID | 12.9 mi |
| 83401 | Idaho Falls, ID | 13.5 mi |
| 83440 | Rexburg, ID | 14 mi |
| 83460 | Rexburg, ID | 15.2 mi |
| 83406 | Idaho Falls, ID | 17.9 mi |
| 83404 | Idaho Falls, ID | 18 mi |
| 83425 | Hamer, ID | 19.2 mi |
| 83448 | Sugar City, ID | 19.7 mi |
Questions about 83431
What is the ZIP+4 code for 83431?
83431 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 83431, you need to look up a specific street address to get them.
What city is 83431?
83431 is assigned to Lewisville, Idaho, in Jefferson 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.