ZIP Code 50450 — Lake Mills, IA
50450 is a standard (street delivery) ZIP code serving Lake Mills, Iowa, in Winnebago 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 50450 at a glance
| ZIP code | 50450 |
|---|---|
| Primary city | Lake Mills |
| State | Iowa (IA) |
| County | Winnebago FIPS 19189 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,952 |
| Coordinates | 43.420450, -93.519980 |
How ZIP+4 works in 50450
The four digits after the hyphen encode a delivery segment inside 50450. 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 50450 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 50450.
| ZIP | City | Distance |
|---|---|---|
| 50446 | Joice, IA | 6.6 mi |
| 56029 | Emmons, MN | 7.2 mi |
| 50453 | Leland, IA | 7.6 mi |
| 50473 | Scarville, IA | 8.3 mi |
| 56089 | Twin Lakes, MN | 10 mi |
| 50444 | Hanlontown, IA | 11.1 mi |
| 50434 | Fertile, IA | 11.6 mi |
| 56051 | Kiester, MN | 12.4 mi |
| 50436 | Forest City, IA | 13 mi |
| 50478 | Thompson, IA | 13.3 mi |
| 56020 | Conger, MN | 13.4 mi |
| 50459 | Northwood, IA | 13.4 mi |
Questions about 50450
What is the ZIP+4 code for 50450?
50450 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 50450, you need to look up a specific street address to get them.
What city is 50450?
50450 is assigned to Lake Mills, Iowa, in Winnebago 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.