ZIP Code 50631 — Frederika, IA
50631 is a standard (street delivery) ZIP code serving Frederika, Iowa, in Bremer 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 50631 at a glance
| ZIP code | 50631 |
|---|---|
| Primary city | Frederika |
| State | Iowa (IA) |
| County | Bremer FIPS 19017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 225 |
| Coordinates | 42.882540, -92.309290 |
How ZIP+4 works in 50631
The four digits after the hyphen encode a delivery segment inside 50631. 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 50631 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 50631.
| ZIP | City | Distance |
|---|---|---|
| 50676 | Tripoli, IA | 6.3 mi |
| 50630 | Fredericksburg, IA | 7 mi |
| 50674 | Sumner, IA | 10.1 mi |
| 50666 | Plainfield, IA | 10.2 mi |
| 50677 | Waverly, IA | 10.5 mi |
| 50645 | Ionia, IA | 11.9 mi |
| 50658 | Nashua, IA | 12.5 mi |
| 50668 | Readlyn, IA | 13.9 mi |
| 50659 | New Hampton, IA | 14.2 mi |
| 50622 | Denver, IA | 14.5 mi |
| 50681 | Westgate, IA | 16.8 mi |
| 50664 | Oran, IA | 17 mi |
Questions about 50631
What is the ZIP+4 code for 50631?
50631 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 50631, you need to look up a specific street address to get them.
What city is 50631?
50631 is assigned to Frederika, Iowa, in Bremer 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.