ZIP Code 50638 — Grundy Center, IA
50638 is a standard (street delivery) ZIP code serving Grundy Center, Iowa, in Grundy 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 50638 at a glance
| ZIP code | 50638 |
|---|---|
| Primary city | Grundy Center |
| State | Iowa (IA) |
| County | Grundy FIPS 19075 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,441 |
| Coordinates | 42.356540, -92.794950 |
How ZIP+4 works in 50638
The four digits after the hyphen encode a delivery segment inside 50638. 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 50638 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 50638.
| ZIP | City | Distance |
|---|---|---|
| 50642 | Holland, IA | 5.8 mi |
| 50657 | Morrison, IA | 6.2 mi |
| 50652 | Lincoln, IA | 8.2 mi |
| 50609 | Beaman, IA | 8.7 mi |
| 50680 | Wellsburg, IA | 9.2 mi |
| 50669 | Reinbeck, IA | 9.4 mi |
| 50621 | Conrad, IA | 9.8 mi |
| 50624 | Dike, IA | 10.4 mi |
| 50635 | Gladbrook, IA | 11.9 mi |
| 50673 | Stout, IA | 12.4 mi |
| 50269 | Whitten, IA | 12.8 mi |
| 50672 | Steamboat Rock, IA | 14.6 mi |
Questions about 50638
What is the ZIP+4 code for 50638?
50638 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 50638, you need to look up a specific street address to get them.
What city is 50638?
50638 is assigned to Grundy Center, Iowa, in Grundy 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.