ZIP Code 51002 — Alta, IA
51002 is a standard (street delivery) ZIP code serving Alta, Iowa, in Buena Vista 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 51002 at a glance
| ZIP code | 51002 |
|---|---|
| Primary city | Alta |
| State | Iowa (IA) |
| County | Buena Vista FIPS 19021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,787 |
| Coordinates | 42.698590, -95.318630 |
How ZIP+4 works in 51002
The four digits after the hyphen encode a delivery segment inside 51002. 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 51002 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 51002.
| ZIP | City | Distance |
|---|---|---|
| 51005 | Aurelia, IA | 5.6 mi |
| 50592 | Truesdale, IA | 7.2 mi |
| 50588 | Storm Lake, IA | 8.3 mi |
| 50576 | Rembrandt, IA | 10.1 mi |
| 51012 | Cherokee, IA | 12.7 mi |
| 51020 | Galva, IA | 13.7 mi |
| 51053 | Schaller, IA | 14.2 mi |
| 51033 | Linn Grove, IA | 15.4 mi |
| 51047 | Peterson, IA | 16.4 mi |
| 50567 | Nemaha, IA | 16.9 mi |
| 51029 | Larrabee, IA | 17.1 mi |
| 50585 | Sioux Rapids, IA | 17.2 mi |
Questions about 51002
What is the ZIP+4 code for 51002?
51002 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 51002, you need to look up a specific street address to get them.
What city is 51002?
51002 is assigned to Alta, Iowa, in Buena Vista 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.