ZIP Code 57049 — North Sioux City, SD
57049 is a standard (street delivery) ZIP code serving North Sioux City, South Dakota, in Union 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 57049 at a glance
| ZIP code | 57049 |
|---|---|
| Primary city | North Sioux City |
| State | South Dakota (SD) |
| County | Union FIPS 46127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,962 |
| Coordinates | 42.524860, -96.507320 |
How ZIP+4 works in 57049
The four digits after the hyphen encode a delivery segment inside 57049. 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 57049 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 57049.
| ZIP | City | Distance |
|---|---|---|
| 51103 | Sioux City, IA | 3.1 mi |
| 51109 | Sioux City, IA | 5.3 mi |
| 57038 | Jefferson, SD | 5.3 mi |
| 51104 | Sioux City, IA | 5.3 mi |
| 68776 | South Sioux City, NE | 5.5 mi |
| 51101 | Sioux City, IA | 6.2 mi |
| 68743 | Jackson, NE | 7 mi |
| 51105 | Sioux City, IA | 7.2 mi |
| 68731 | Dakota City, NE | 8 mi |
| 51108 | Sioux City, IA | 8.6 mi |
| 51111 | Sioux City, IA | 10 mi |
| 51106 | Sioux City, IA | 10.4 mi |
Questions about 57049
What is the ZIP+4 code for 57049?
57049 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 57049, you need to look up a specific street address to get them.
What city is 57049?
57049 is assigned to North Sioux City, South Dakota, in Union 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.