ZIP Code 50431 — Coulter, IA
50431 is a standard (street delivery) ZIP code serving Coulter, Iowa, in Franklin 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 50431 at a glance
| ZIP code | 50431 |
|---|---|
| Primary city | Coulter |
| State | Iowa (IA) |
| County | Franklin FIPS 19069 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 228 |
| Coordinates | 42.736480, -93.369890 |
How ZIP+4 works in 50431
The four digits after the hyphen encode a delivery segment inside 50431. 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 50431 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 50431.
| ZIP | City | Distance |
|---|---|---|
| 50452 | Latimer, IA | 3 mi |
| 50420 | Alexander, IA | 6.5 mi |
| 50441 | Hampton, IA | 7.5 mi |
| 50071 | Dows, IA | 9.2 mi |
| 50470 | Rowan, IA | 9.3 mi |
| 50041 | Bradford, IA | 9.4 mi |
| 50427 | Chapin, IA | 10.2 mi |
| 50227 | Popejoy, IA | 10.3 mi |
| 50475 | Sheffield, IA | 12.5 mi |
| 50633 | Geneva, IA | 13.1 mi |
| 50457 | Meservey, IA | 13.8 mi |
| 50101 | Galt, IA | 14.2 mi |
Questions about 50431
What is the ZIP+4 code for 50431?
50431 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 50431, you need to look up a specific street address to get them.
What city is 50431?
50431 is assigned to Coulter, Iowa, in Franklin 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.