ZIP Code 50156 — Madrid, IA
50156 is a standard (street delivery) ZIP code serving Madrid, Iowa, in Boone 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 50156 at a glance
| ZIP code | 50156 |
|---|---|
| Primary city | Madrid |
| State | Iowa (IA) |
| County | Boone FIPS 19015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,575 |
| Coordinates | 41.903490, -93.800010 |
How ZIP+4 works in 50156
The four digits after the hyphen encode a delivery segment inside 50156. 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 50156 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 50156.
| ZIP | City | Distance |
|---|---|---|
| 50152 | Luther, IA | 4.6 mi |
| 50243 | Sheldahl, IA | 5.9 mi |
| 50134 | Kelley, IA | 6.9 mi |
| 50276 | Woodward, IA | 7 mi |
| 50244 | Slater, IA | 8.5 mi |
| 50226 | Polk City, IA | 8.8 mi |
| 50109 | Granger, IA | 9.4 mi |
| 50124 | Huxley, IA | 10.1 mi |
| 50013 | Ames, IA | 11.1 mi |
| 50014 | Ames, IA | 11.5 mi |
| 50012 | Ames, IA | 11.6 mi |
| 50039 | Bouton, IA | 11.9 mi |
Questions about 50156
What is the ZIP+4 code for 50156?
50156 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 50156, you need to look up a specific street address to get them.
What city is 50156?
50156 is assigned to Madrid, Iowa, in Boone 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.