ZIP Code 51535 — Griswold, IA
51535 is a standard (street delivery) ZIP code serving Griswold, Iowa, in Cass 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 51535 at a glance
| ZIP code | 51535 |
|---|---|
| Primary city | Griswold |
| State | Iowa (IA) |
| County | Cass FIPS 19029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,697 |
| Coordinates | 41.226400, -95.132410 |
How ZIP+4 works in 51535
The four digits after the hyphen encode a delivery segment inside 51535. 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 51535 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 51535.
| ZIP | City | Distance |
|---|---|---|
| 51544 | Lewis, IA | 6.1 mi |
| 51532 | Elliott, IA | 6.5 mi |
| 50847 | Grant, IA | 9.7 mi |
| 50843 | Cumberland, IA | 12.7 mi |
| 50022 | Atlantic, IA | 14.8 mi |
| 51525 | Carson, IA | 14.9 mi |
| 51560 | Oakland, IA | 15.2 mi |
| 51566 | Red Oak, IA | 15.4 mi |
| 51541 | Henderson, IA | 16 mi |
| 51536 | Hancock, IA | 16.1 mi |
| 51577 | Walnut, IA | 16.8 mi |
| 51549 | Macedonia, IA | 17 mi |
Questions about 51535
What is the ZIP+4 code for 51535?
51535 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 51535, you need to look up a specific street address to get them.
What city is 51535?
51535 is assigned to Griswold, Iowa, in Cass 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.