ZIP Code 50440 — Grafton, IA
50440 is a standard (street delivery) ZIP code serving Grafton, Iowa, in Worth 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 50440 at a glance
| ZIP code | 50440 |
|---|---|
| Primary city | Grafton |
| State | Iowa (IA) |
| County | Worth FIPS 19195 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 361 |
| Coordinates | 43.332130, -93.068910 |
How ZIP+4 works in 50440
The four digits after the hyphen encode a delivery segment inside 50440. 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 50440 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 50440.
| ZIP | City | Distance |
|---|---|---|
| 50464 | Plymouth, IA | 5.6 mi |
| 50426 | Carpenter, IA | 6.3 mi |
| 50456 | Manly, IA | 8 mi |
| 50467 | Rock Falls, IA | 8.5 mi |
| 50472 | Saint Ansgar, IA | 8.8 mi |
| 50448 | Kensett, IA | 9.1 mi |
| 50459 | Northwood, IA | 12.2 mi |
| 50458 | Nora Springs, IA | 12.3 mi |
| 50461 | Osage, IA | 13 mi |
| 50401 | Mason City, IA | 13.9 mi |
| 55953 | Lyle, MN | 14.5 mi |
| 50471 | Rudd, IA | 15 mi |
Questions about 50440
What is the ZIP+4 code for 50440?
50440 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 50440, you need to look up a specific street address to get them.
What city is 50440?
50440 is assigned to Grafton, Iowa, in Worth 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.