ZIP Code 52738 — Columbus Junction, IA
52738 is a standard (street delivery) ZIP code serving Columbus Junction, Iowa, in Louisa 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 52738 at a glance
| ZIP code | 52738 |
|---|---|
| Primary city | Columbus Junction |
| State | Iowa (IA) |
| County | Louisa FIPS 19115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,398 |
| Coordinates | 41.273600, -91.380720 |
How ZIP+4 works in 52738
The four digits after the hyphen encode a delivery segment inside 52738. 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 52738 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 52738.
| ZIP | City | Distance |
|---|---|---|
| 52737 | Columbus City, IA | 1 mi |
| 52739 | Conesville, IA | 6.9 mi |
| 52754 | Letts, IA | 8.6 mi |
| 52621 | Crawfordsville, IA | 9.1 mi |
| 52201 | Ainsworth, IA | 9.5 mi |
| 52752 | Grandview, IA | 9.8 mi |
| 52659 | Winfield, IA | 10.1 mi |
| 52647 | Olds, IA | 12.9 mi |
| 52640 | Morning Sun, IA | 13.2 mi |
| 52766 | Nichols, IA | 13.8 mi |
| 52653 | Wapello, IA | 13.8 mi |
| 52749 | Fruitland, IA | 13.9 mi |
Questions about 52738
What is the ZIP+4 code for 52738?
52738 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 52738, you need to look up a specific street address to get them.
What city is 52738?
52738 is assigned to Columbus Junction, Iowa, in Louisa 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.