ZIP Code 45817 — Bluffton, OH
45817 is a standard (street delivery) ZIP code serving Bluffton, Ohio, in Allen 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 45817 at a glance
| ZIP code | 45817 |
|---|---|
| Primary city | Bluffton |
| State | Ohio (OH) |
| County | Allen FIPS 39003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 5,926 |
| Coordinates | 40.876910, -83.882790 |
How ZIP+4 works in 45817
The four digits after the hyphen encode a delivery segment inside 45817. 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 45817 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 45817.
| ZIP | City | Distance |
|---|---|---|
| 45808 | Beaverdam, OH | 5.6 mi |
| 45877 | Pandora, OH | 6 mi |
| 45868 | Mount Cory, OH | 6.7 mi |
| 45881 | Rawson, OH | 7.6 mi |
| 45841 | Jenera, OH | 7.7 mi |
| 45810 | Ada, OH | 7.8 mi |
| 45854 | Lafayette, OH | 9 mi |
| 45816 | Benton Ridge, OH | 10 mi |
| 45801 | Lima, OH | 10.7 mi |
| 45820 | Cairo, OH | 11 mi |
| 45830 | Columbus Grove, OH | 11.1 mi |
| 45850 | Harrod, OH | 12.1 mi |
Questions about 45817
What is the ZIP+4 code for 45817?
45817 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 45817, you need to look up a specific street address to get them.
What city is 45817?
45817 is assigned to Bluffton, Ohio, in Allen 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.