ZIP Code 50128 — Jamaica, IA
50128 is a standard (street delivery) ZIP code serving Jamaica, Iowa, in Guthrie 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 50128 at a glance
| ZIP code | 50128 |
|---|---|
| Primary city | Jamaica |
| State | Iowa (IA) |
| County | Guthrie FIPS 19077 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 330 |
| Coordinates | 41.851730, -94.298530 |
How ZIP+4 works in 50128
The four digits after the hyphen encode a delivery segment inside 50128. 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 50128 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 50128.
| ZIP | City | Distance |
|---|---|---|
| 50066 | Dawson, IA | 4.9 mi |
| 50277 | Yale, IA | 5.6 mi |
| 50235 | Rippey, IA | 7.1 mi |
| 50026 | Bagley, IA | 7.8 mi |
| 50220 | Perry, IA | 9.1 mi |
| 50216 | Panora, IA | 10.9 mi |
| 50129 | Jefferson, IA | 11.8 mi |
| 50146 | Linden, IA | 12.1 mi |
| 50029 | Bayard, IA | 13.1 mi |
| 50107 | Grand Junction, IA | 13.3 mi |
| 50167 | Minburn, IA | 14.8 mi |
| 50039 | Bouton, IA | 15.1 mi |
Questions about 50128
What is the ZIP+4 code for 50128?
50128 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 50128, you need to look up a specific street address to get them.
What city is 50128?
50128 is assigned to Jamaica, Iowa, in Guthrie 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.