ZIP Code 52161 — Ossian, IA
52161 is a standard (street delivery) ZIP code serving Ossian, Iowa, in Winneshiek 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 52161 at a glance
| ZIP code | 52161 |
|---|---|
| Primary city | Ossian |
| State | Iowa (IA) |
| County | Winneshiek FIPS 19191 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,532 |
| Coordinates | 43.127330, -91.756230 |
How ZIP+4 works in 52161
The four digits after the hyphen encode a delivery segment inside 52161. 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 52161 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 52161.
| ZIP | City | Distance |
|---|---|---|
| 52133 | Castalia, IA | 4.6 mi |
| 52135 | Clermont, IA | 8.8 mi |
| 52175 | West Union, IA | 9.8 mi |
| 52132 | Calmar, IA | 9.9 mi |
| 52166 | Saint Lucas, IA | 9.9 mi |
| 52144 | Fort Atkinson, IA | 10.3 mi |
| 52162 | Postville, IA | 10.3 mi |
| 52168 | Spillville, IA | 11.2 mi |
| 52141 | Elgin, IA | 14.4 mi |
| 52171 | Waucoma, IA | 15.1 mi |
| 52156 | Luana, IA | 15.5 mi |
| 52101 | Decorah, IA | 15.9 mi |
Questions about 52161
What is the ZIP+4 code for 52161?
52161 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 52161, you need to look up a specific street address to get them.
What city is 52161?
52161 is assigned to Ossian, Iowa, in Winneshiek 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.