ZIP Code 45303 — Ansonia, OH
45303 is a standard (street delivery) ZIP code serving Ansonia, Ohio, in Darke 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 45303 at a glance
| ZIP code | 45303 |
|---|---|
| Primary city | Ansonia |
| State | Ohio (OH) |
| County | Darke FIPS 39037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,188 |
| Coordinates | 40.214600, -84.656270 |
How ZIP+4 works in 45303
The four digits after the hyphen encode a delivery segment inside 45303. 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 45303 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 45303.
| ZIP | City | Distance |
|---|---|---|
| 45362 | Rossburg, OH | 5.1 mi |
| 45390 | Union City, OH | 5.9 mi |
| 45348 | New Weston, OH | 7.7 mi |
| 45380 | Versailles, OH | 7.8 mi |
| 45331 | Greenville, OH | 8.1 mi |
| 45350 | North Star, OH | 8.8 mi |
| 45310 | Burkettsville, OH | 9.6 mi |
| 47390 | Union City, IN | 10.1 mi |
| 45328 | Gettysburg, OH | 10.8 mi |
| 45351 | Osgood, OH | 12.1 mi |
| 45388 | Yorkshire, OH | 12.2 mi |
| 45308 | Bradford, OH | 12.2 mi |
Questions about 45303
What is the ZIP+4 code for 45303?
45303 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 45303, you need to look up a specific street address to get them.
What city is 45303?
45303 is assigned to Ansonia, Ohio, in Darke 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.