ZIP Code 51529 — Dunlap, IA
51529 is a standard (street delivery) ZIP code serving Dunlap, Iowa, in Harrison 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 51529 at a glance
| ZIP code | 51529 |
|---|---|
| Primary city | Dunlap |
| State | Iowa (IA) |
| County | Harrison FIPS 19085 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,732 |
| Coordinates | 41.861800, -95.625910 |
How ZIP+4 works in 51529
The four digits after the hyphen encode a delivery segment inside 51529. 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 51529 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 51529.
| ZIP | City | Distance |
|---|---|---|
| 51528 | Dow City, IA | 7.8 mi |
| 51579 | Woodbine, IA | 8.7 mi |
| 51520 | Arion, IA | 11.3 mi |
| 51562 | Panama, IA | 11.4 mi |
| 51530 | Earling, IA | 11.6 mi |
| 51572 | Soldier, IA | 12.2 mi |
| 51060 | Ute, IA | 13 mi |
| 51558 | Moorhead, IA | 13.1 mi |
| 51527 | Defiance, IA | 14.5 mi |
| 51564 | Pisgah, IA | 14.9 mi |
| 51439 | Charter Oak, IA | 15.4 mi |
| 51578 | Westphalia, IA | 15.4 mi |
Questions about 51529
What is the ZIP+4 code for 51529?
51529 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 51529, you need to look up a specific street address to get them.
What city is 51529?
51529 is assigned to Dunlap, Iowa, in Harrison 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.