ZIP Code 50131 — Johnston, IA
50131 is a standard (street delivery) ZIP code serving Johnston, Iowa, in Polk 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 50131 at a glance
| ZIP code | 50131 |
|---|---|
| Primary city | Johnston |
| State | Iowa (IA) |
| County | Polk FIPS 19153 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 24,583 |
| Coordinates | 41.697490, -93.720210 |
How ZIP+4 works in 50131
The four digits after the hyphen encode a delivery segment inside 50131. 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 50131 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 50131.
| ZIP | City | Distance |
|---|---|---|
| 50111 | Grimes, IA | 4.3 mi |
| 50322 | Urbandale, IA | 4.5 mi |
| 50023 | Ankeny, IA | 4.9 mi |
| 50310 | Des Moines, IA | 5.4 mi |
| 50313 | Des Moines, IA | 5.8 mi |
| 50324 | Windsor Heights, IA | 6.4 mi |
| 50323 | Urbandale, IA | 6.5 mi |
| 50109 | Granger, IA | 6.6 mi |
| 50226 | Polk City, IA | 6.9 mi |
| 50325 | Clive, IA | 7 mi |
| 50311 | Des Moines, IA | 7.1 mi |
| 50314 | Des Moines, IA | 7.9 mi |
Questions about 50131
What is the ZIP+4 code for 50131?
50131 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 50131, you need to look up a specific street address to get them.
What city is 50131?
50131 is assigned to Johnston, Iowa, in Polk 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.