ZIP Code 51346 — Hartley, IA
51346 is a standard (street delivery) ZIP code serving Hartley, Iowa, in O'Brien 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 51346 at a glance
| ZIP code | 51346 |
|---|---|
| Primary city | Hartley |
| State | Iowa (IA) |
| County | O'Brien FIPS 19141 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,247 |
| Coordinates | 43.186380, -95.459270 |
How ZIP+4 works in 51346
The four digits after the hyphen encode a delivery segment inside 51346. 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 51346 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 51346.
| ZIP | City | Distance |
|---|---|---|
| 51338 | Everly, IA | 7 mi |
| 51248 | Sanborn, IA | 10.1 mi |
| 51245 | Primghar, IA | 10.4 mi |
| 51350 | Melvin, IA | 10.9 mi |
| 51357 | Royal, IA | 12.2 mi |
| 51058 | Sutherland, IA | 14 mi |
| 51231 | Archer, IA | 15.2 mi |
| 51301 | Spencer, IA | 15.7 mi |
| 51340 | Fostoria, IA | 15.7 mi |
| 51345 | Harris, IA | 16 mi |
| 51354 | Ocheyedan, IA | 16.2 mi |
| 51351 | Milford, IA | 16.4 mi |
Questions about 51346
What is the ZIP+4 code for 51346?
51346 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 51346, you need to look up a specific street address to get them.
What city is 51346?
51346 is assigned to Hartley, Iowa, in O'Brien 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.