ZIP Code 83427 — Iona, ID
83427 is a standard (street delivery) ZIP code serving Iona, Idaho, in Bonneville 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 83427 at a glance
| ZIP code | 83427 |
|---|---|
| Primary city | Iona |
| State | Idaho (ID) |
| County | Bonneville FIPS 16019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Boise |
| Population | 2,931 |
| Coordinates | 43.359360, -111.750640 |
How ZIP+4 works in 83427
The four digits after the hyphen encode a delivery segment inside 83427. 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 83427 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 83427.
| ZIP | City | Distance |
|---|---|---|
| 83406 | Idaho Falls, ID | 10.7 mi |
| 83401 | Idaho Falls, ID | 13.2 mi |
| 83236 | Firth, ID | 13.4 mi |
| 83443 | Ririe, ID | 14 mi |
| 83404 | Idaho Falls, ID | 14.1 mi |
| 83274 | Shelley, ID | 17.5 mi |
| 83442 | Rigby, ID | 19 mi |
| 83454 | Ucon, ID | 19.3 mi |
| 83449 | Swan Valley, ID | 20.1 mi |
| 83218 | Basalt, ID | 21 mi |
| 83402 | Idaho Falls, ID | 24 mi |
| 83431 | Lewisville, ID | 26.7 mi |
Questions about 83427
What is the ZIP+4 code for 83427?
83427 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 83427, you need to look up a specific street address to get them.
What city is 83427?
83427 is assigned to Iona, Idaho, in Bonneville 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.