ZIP Code 52638 — Middletown, IA
52638 is a standard (street delivery) ZIP code serving Middletown, Iowa, in Des Moines 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 52638 at a glance
| ZIP code | 52638 |
|---|---|
| Primary city | Middletown |
| State | Iowa (IA) |
| County | Des Moines FIPS 19057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 508 |
| Coordinates | 40.798640, -91.245770 |
How ZIP+4 works in 52638
The four digits after the hyphen encode a delivery segment inside 52638. 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 52638 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 52638.
| ZIP | City | Distance |
|---|---|---|
| 52655 | West Burlington, IA | 3.8 mi |
| 52623 | Danville, IA | 6.3 mi |
| 52624 | Denmark, IA | 6.5 mi |
| 52658 | Wever, IA | 6.9 mi |
| 52601 | Burlington, IA | 8 mi |
| 61425 | Carman, IL | 10.7 mi |
| 52627 | Fort Madison, IA | 11.1 mi |
| 52650 | Sperry, IA | 11.3 mi |
| 52645 | New London, IA | 11.4 mi |
| 52656 | West Point, IA | 12 mi |
| 61454 | Lomax, IL | 13.2 mi |
| 52660 | Yarmouth, IA | 13.6 mi |
Questions about 52638
What is the ZIP+4 code for 52638?
52638 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 52638, you need to look up a specific street address to get them.
What city is 52638?
52638 is assigned to Middletown, Iowa, in Des Moines 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.