ZIP Code 52320 — Olin, IA
52320 is a standard (street delivery) ZIP code serving Olin, Iowa, in Jones 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 52320 at a glance
| ZIP code | 52320 |
|---|---|
| Primary city | Olin |
| State | Iowa (IA) |
| County | Jones FIPS 19105 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,425 |
| Coordinates | 41.999970, -91.146430 |
How ZIP+4 works in 52320
The four digits after the hyphen encode a delivery segment inside 52320. 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 52320 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 52320.
| ZIP | City | Distance |
|---|---|---|
| 52312 | Morley, IA | 5.1 mi |
| 52212 | Center Junction, IA | 8.1 mi |
| 52337 | Stanwood, IA | 8.1 mi |
| 52362 | Wyoming, IA | 8.4 mi |
| 52306 | Mechanicsville, IA | 8.9 mi |
| 52216 | Clarence, IA | 9.1 mi |
| 52323 | Oxford Junction, IA | 10 mi |
| 52305 | Martelle, IA | 10.1 mi |
| 52205 | Anamosa, IA | 10.9 mi |
| 52253 | Lisbon, IA | 12.7 mi |
| 52321 | Onslow, IA | 12.9 mi |
| 52255 | Lowden, IA | 13.4 mi |
Questions about 52320
What is the ZIP+4 code for 52320?
52320 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 52320, you need to look up a specific street address to get them.
What city is 52320?
52320 is assigned to Olin, Iowa, in Jones 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.