ZIP Code 45356 — Piqua, OH
45356 is a standard (street delivery) ZIP code serving Piqua, Ohio, in Miami 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 45356 at a glance
| ZIP code | 45356 |
|---|---|
| Primary city | Piqua |
| State | Ohio (OH) |
| County | Miami FIPS 39109 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 25,237 |
| Coordinates | 40.162520, -84.230970 |
How ZIP+4 works in 45356
The four digits after the hyphen encode a delivery segment inside 45356. 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 45356 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 45356.
| ZIP | City | Distance |
|---|---|---|
| 45318 | Covington, OH | 6.9 mi |
| 45326 | Fletcher, OH | 7.5 mi |
| 45333 | Houston, OH | 8 mi |
| 45373 | Troy, OH | 9.1 mi |
| 45365 | Sidney, OH | 9.2 mi |
| 45359 | Pleasant Hill, OH | 10 mi |
| 45363 | Russia, OH | 10.3 mi |
| 45312 | Casstown, OH | 10.6 mi |
| 45317 | Conover, OH | 11.2 mi |
| 45308 | Bradford, OH | 12.2 mi |
| 45339 | Ludlow Falls, OH | 12.2 mi |
| 45389 | Christiansburg, OH | 13.1 mi |
Questions about 45356
What is the ZIP+4 code for 45356?
45356 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 45356, you need to look up a specific street address to get them.
What city is 45356?
45356 is assigned to Piqua, Ohio, in Miami 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.