ZIP Code 51650 — Riverton, IA
51650 is a standard (street delivery) ZIP code serving Riverton, Iowa, 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 51650 at a glance
| ZIP code | 51650 |
|---|---|
| Primary city | Riverton |
| State | Iowa (IA) |
| County | Fremont FIPS 19071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 197 |
| Coordinates | 40.673000, -95.549200 |
How ZIP+4 works in 51650
The four digits after the hyphen encode a delivery segment inside 51650. 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 51650 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 51650.
| ZIP | City | Distance |
|---|---|---|
| 51639 | Farragut, IA | 5.1 mi |
| 51640 | Hamburg, IA | 6.9 mi |
| 51652 | Sidney, IA | 7.9 mi |
| 51601 | Shenandoah, IA | 11.1 mi |
| 51647 | Northboro, IA | 11.7 mi |
| 51649 | Randolph, IA | 12.4 mi |
| 64496 | Watson, MO | 12.8 mi |
| 51648 | Percival, IA | 14.1 mi |
| 64482 | Rock Port, MO | 15.2 mi |
| 64498 | Westboro, MO | 15.4 mi |
| 51654 | Thurman, IA | 15.5 mi |
| 51645 | Imogene, IA | 15.9 mi |
Questions about 51650
What is the ZIP+4 code for 51650?
51650 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 51650, you need to look up a specific street address to get them.
What city is 51650?
51650 is assigned to Riverton, Iowa, 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.