ZIP Code 83854 — Post Falls, ID
83854 is a standard (street delivery) ZIP code serving Post Falls, Idaho, in Kootenai 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 83854 at a glance
| ZIP code | 83854 |
|---|---|
| Primary city | Post Falls |
| State | Idaho (ID) |
| County | Kootenai FIPS 16055 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 54,851 |
| Coordinates | 47.726700, -116.975110 |
How ZIP+4 works in 83854
The four digits after the hyphen encode a delivery segment inside 83854. 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 83854 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 83854.
| ZIP | City | Distance |
|---|---|---|
| 99025 | Newman Lake, WA | 6.8 mi |
| 99027 | Otis Orchards, WA | 7.2 mi |
| 99019 | Liberty Lake, WA | 7.5 mi |
| 83815 | Coeur D Alene, ID | 8.7 mi |
| 83858 | Rathdrum, ID | 9.3 mi |
| 99016 | Greenacres, WA | 10.8 mi |
| 99216 | Spokane, WA | 11.3 mi |
| 83814 | Coeur D Alene, ID | 11.8 mi |
| 99037 | Veradale, WA | 12 mi |
| 99021 | Mead, WA | 13 mi |
| 99217 | Spokane, WA | 13.4 mi |
| 99023 | Mica, WA | 13.7 mi |
Questions about 83854
What is the ZIP+4 code for 83854?
83854 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 83854, you need to look up a specific street address to get them.
What city is 83854?
83854 is assigned to Post Falls, Idaho, in Kootenai 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.