ZIP Code 52640 — Morning Sun, IA
52640 is a standard (street delivery) ZIP code serving Morning Sun, 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 52640 at a glance
| ZIP code | 52640 |
|---|---|
| Primary city | Morning Sun |
| State | Iowa (IA) |
| County | Louisa FIPS 19115 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,274 |
| Coordinates | 41.096490, -91.282050 |
How ZIP+4 works in 52640
The four digits after the hyphen encode a delivery segment inside 52640. 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 52640 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 52640.
| ZIP | City | Distance |
|---|---|---|
| 52660 | Yarmouth, IA | 7.3 mi |
| 52644 | Mount Union, IA | 8 mi |
| 52653 | Wapello, IA | 8.1 mi |
| 52659 | Winfield, IA | 8.4 mi |
| 52637 | Mediapolis, IA | 9.2 mi |
| 52650 | Sperry, IA | 12.1 mi |
| 52737 | Columbus City, IA | 12.2 mi |
| 52752 | Grandview, IA | 13.2 mi |
| 52738 | Columbus Junction, IA | 13.3 mi |
| 52647 | Olds, IA | 13.9 mi |
| 52645 | New London, IA | 14 mi |
| 52652 | Swedesburg, IA | 14.2 mi |
Questions about 52640
What is the ZIP+4 code for 52640?
52640 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 52640, you need to look up a specific street address to get them.
What city is 52640?
52640 is assigned to Morning Sun, 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.