ZIP Code 50654 — Masonville, IA
50654 is a standard (street delivery) ZIP code serving Masonville, Iowa, in Buchanan 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 50654 at a glance
| ZIP code | 50654 |
|---|---|
| Primary city | Masonville |
| State | Iowa (IA) |
| County | Buchanan FIPS 19019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 275 |
| Coordinates | 42.458120, -91.609330 |
How ZIP+4 works in 50654
The four digits after the hyphen encode a delivery segment inside 50654. 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 50654 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 50654.
| ZIP | City | Distance |
|---|---|---|
| 50682 | Winthrop, IA | 4.6 mi |
| 52057 | Manchester, IA | 8.3 mi |
| 52326 | Quasqueton, IA | 8.7 mi |
| 52330 | Ryan, IA | 9.1 mi |
| 52038 | Dundee, IA | 9.2 mi |
| 50650 | Lamont, IA | 11.3 mi |
| 52218 | Coggon, IA | 11.8 mi |
| 52344 | Troy Mills, IA | 12.1 mi |
| 50607 | Aurora, IA | 12.5 mi |
| 52036 | Delaware, IA | 13.7 mi |
| 52329 | Rowley, IA | 14.2 mi |
| 52352 | Walker, IA | 14.6 mi |
Questions about 50654
What is the ZIP+4 code for 50654?
50654 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 50654, you need to look up a specific street address to get them.
What city is 50654?
50654 is assigned to Masonville, Iowa, in Buchanan 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.