ZIP Code 51571 — Silver City, IA
51571 is a standard (street delivery) ZIP code serving Silver City, Iowa, in Mills 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 51571 at a glance
| ZIP code | 51571 |
|---|---|
| Primary city | Silver City |
| State | Iowa (IA) |
| County | Mills FIPS 19129 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 902 |
| Coordinates | 41.145820, -95.609940 |
How ZIP+4 works in 51571
The four digits after the hyphen encode a delivery segment inside 51571. 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 51571 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 51571.
| ZIP | City | Distance |
|---|---|---|
| 51554 | Mineola, IA | 3.7 mi |
| 51575 | Treynor, IA | 6.6 mi |
| 51549 | Macedonia, IA | 8.5 mi |
| 51534 | Glenwood, IA | 9.2 mi |
| 51541 | Henderson, IA | 10.1 mi |
| 51540 | Hastings, IA | 10.2 mi |
| 51503 | Council Bluffs, IA | 10.5 mi |
| 51551 | Malvern, IA | 10.7 mi |
| 51525 | Carson, IA | 11.6 mi |
| 51548 | Mcclelland, IA | 11.9 mi |
| 51533 | Emerson, IA | 14.2 mi |
| 51561 | Pacific Junction, IA | 14.2 mi |
Questions about 51571
What is the ZIP+4 code for 51571?
51571 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 51571, you need to look up a specific street address to get them.
What city is 51571?
51571 is assigned to Silver City, Iowa, in Mills 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.