ZIP Code 83429 — Island Park, ID
83429 is a standard (street delivery) ZIP code serving Island Park, Idaho, in Fremont 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 83429 at a glance
| ZIP code | 83429 |
|---|---|
| Primary city | Island Park |
| State | Idaho (ID) |
| County | Fremont FIPS 16043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Boise |
| Population | 628 |
| Coordinates | 44.486740, -111.373660 |
How ZIP+4 works in 83429
The four digits after the hyphen encode a delivery segment inside 83429. 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 83429 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 83429.
| ZIP | City | Distance |
|---|---|---|
| 83433 | Macks Inn, ID | 2.8 mi |
| 59758 | West Yellowstone, MT | 22.7 mi |
| 83420 | Ashton, ID | 29.6 mi |
| 83445 | Saint Anthony, ID | 33.7 mi |
| 83421 | Chester, ID | 34.3 mi |
| 59720 | Cameron, MT | 34.3 mi |
Questions about 83429
What is the ZIP+4 code for 83429?
83429 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 83429, you need to look up a specific street address to get them.
What city is 83429?
83429 is assigned to Island Park, Idaho, in Fremont 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.