ZIP Code 51647 — Northboro, IA
51647 is a standard (street delivery) ZIP code serving Northboro, Iowa, in Page 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 51647 at a glance
| ZIP code | 51647 |
|---|---|
| Primary city | Northboro |
| State | Iowa (IA) |
| County | Page FIPS 19145 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 172 |
| Coordinates | 40.605390, -95.345090 |
How ZIP+4 works in 51647
The four digits after the hyphen encode a delivery segment inside 51647. 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 51647 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 51647.
| ZIP | City | Distance |
|---|---|---|
| 64498 | Westboro, MO | 4.8 mi |
| 51636 | Coin, IA | 7.2 mi |
| 51630 | Blanchard, IA | 7.9 mi |
| 51601 | Shenandoah, IA | 8.6 mi |
| 51639 | Farragut, IA | 10.3 mi |
| 64491 | Tarkio, MO | 10.8 mi |
| 51650 | Riverton, IA | 11.7 mi |
| 64445 | Elmo, MO | 11.8 mi |
| 51637 | College Springs, IA | 11.9 mi |
| 51656 | Yorktown, IA | 13.4 mi |
| 64482 | Rock Port, MO | 14.8 mi |
| 64496 | Watson, MO | 16.4 mi |
Questions about 51647
What is the ZIP+4 code for 51647?
51647 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 51647, you need to look up a specific street address to get them.
What city is 51647?
51647 is assigned to Northboro, Iowa, in Page 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.