ZIP Code 51054 — Sergeant Bluff, IA
51054 is a standard (street delivery) ZIP code serving Sergeant Bluff, Iowa, in Woodbury 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 51054 at a glance
| ZIP code | 51054 |
|---|---|
| Primary city | Sergeant Bluff |
| State | Iowa (IA) |
| County | Woodbury FIPS 19193 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 5,583 |
| Coordinates | 42.378320, -96.331590 |
How ZIP+4 works in 51054
The four digits after the hyphen encode a delivery segment inside 51054. 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 51054 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 51054.
| ZIP | City | Distance |
|---|---|---|
| 51111 | Sioux City, IA | 3.6 mi |
| 51052 | Salix, IA | 5.8 mi |
| 51106 | Sioux City, IA | 5.9 mi |
| 68030 | Homer, NE | 7.3 mi |
| 51007 | Bronson, IA | 7.5 mi |
| 68731 | Dakota City, NE | 8 mi |
| 68776 | South Sioux City, NE | 8.1 mi |
| 51101 | Sioux City, IA | 8.6 mi |
| 51105 | Sioux City, IA | 9.1 mi |
| 51030 | Lawton, IA | 10.8 mi |
| 51104 | Sioux City, IA | 11.4 mi |
| 51103 | Sioux City, IA | 11.5 mi |
Questions about 51054
What is the ZIP+4 code for 51054?
51054 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 51054, you need to look up a specific street address to get them.
What city is 51054?
51054 is assigned to Sergeant Bluff, Iowa, in Woodbury 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.