ZIP Code 51011 — Chatsworth, IA
51011 is a standard (street delivery) ZIP code serving Chatsworth, Iowa, in Sioux 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 51011 at a glance
| ZIP code | 51011 |
|---|---|
| Primary city | Chatsworth |
| State | Iowa (IA) |
| County | Sioux FIPS 19167 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 54 |
| Coordinates | 42.915620, -96.513880 |
How ZIP+4 works in 51011
The four digits after the hyphen encode a delivery segment inside 51011. 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 51011 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 51011.
| ZIP | City | Distance |
|---|---|---|
| 51001 | Akron, IA | 5.6 mi |
| 51023 | Hawarden, IA | 6.8 mi |
| 57001 | Alcester, SD | 9.1 mi |
| 51027 | Ireton, IA | 10 mi |
| 51008 | Brunsville, IA | 14.4 mi |
| 57034 | Hudson, SD | 14.5 mi |
| 51062 | Westfield, IA | 14.5 mi |
| 57025 | Elk Point, SD | 16.3 mi |
| 51036 | Maurice, IA | 16.8 mi |
| 57010 | Burbank, SD | 17.2 mi |
| 51038 | Merrill, IA | 17.6 mi |
| 57004 | Beresford, SD | 17.9 mi |
Questions about 51011
What is the ZIP+4 code for 51011?
51011 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 51011, you need to look up a specific street address to get them.
What city is 51011?
51011 is assigned to Chatsworth, Iowa, in Sioux 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.