ZIP Code 43512 — Defiance, OH
43512 is a standard (street delivery) ZIP code serving Defiance, Ohio, in Defiance 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 43512 at a glance
| ZIP code | 43512 |
|---|---|
| Primary city | Defiance |
| State | Ohio (OH) |
| County | Defiance FIPS 39039 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 28,022 |
| Coordinates | 41.303090, -84.358740 |
How ZIP+4 works in 43512
The four digits after the hyphen encode a delivery segment inside 43512. 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 43512 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 43512.
| ZIP | City | Distance |
|---|---|---|
| 43530 | Jewell, OH | 4 mi |
| 43519 | Evansport, OH | 8.5 mi |
| 43549 | Ney, OH | 9.6 mi |
| 43555 | Ridgeville Corners, OH | 10.7 mi |
| 43556 | Sherwood, OH | 10.9 mi |
| 43527 | Holgate, OH | 10.9 mi |
| 45821 | Cecil, OH | 11.8 mi |
| 43548 | New Bavaria, OH | 12.5 mi |
| 43557 | Stryker, OH | 12.6 mi |
| 45873 | Oakwood, OH | 12.8 mi |
| 43545 | Napoleon, OH | 13.5 mi |
| 43536 | Mark Center, OH | 14.3 mi |
Questions about 43512
What is the ZIP+4 code for 43512?
43512 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 43512, you need to look up a specific street address to get them.
What city is 43512?
43512 is assigned to Defiance, Ohio, in Defiance 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.