ZIP Code 45146 — Martinsville, OH
45146 is a standard (street delivery) ZIP code serving Martinsville, Ohio, in Clinton 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 45146 at a glance
| ZIP code | 45146 |
|---|---|
| Primary city | Martinsville |
| State | Ohio (OH) |
| County | Clinton FIPS 39027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,324 |
| Coordinates | 39.315400, -83.799450 |
How ZIP+4 works in 45146
The four digits after the hyphen encode a delivery segment inside 45146. 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 45146 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 45146.
| ZIP | City | Distance |
|---|---|---|
| 45148 | Midland, OH | 4.9 mi |
| 45159 | New Vienna, OH | 6 mi |
| 45142 | Lynchburg, OH | 7.3 mi |
| 45107 | Blanchester, OH | 9.3 mi |
| 45177 | Wilmington, OH | 10.3 mi |
| 45132 | Highland, OH | 10.8 mi |
| 45113 | Clarksville, OH | 11.5 mi |
| 45118 | Fayetteville, OH | 12.1 mi |
| 45166 | Reesville, OH | 12.6 mi |
| 45135 | Leesburg, OH | 13.6 mi |
| 45162 | Pleasant Plain, OH | 15.2 mi |
| 45169 | Sabina, OH | 15.3 mi |
Questions about 45146
What is the ZIP+4 code for 45146?
45146 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 45146, you need to look up a specific street address to get them.
What city is 45146?
45146 is assigned to Martinsville, Ohio, in Clinton 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.