ZIP Code 45172 — Sinking Spring, OH
45172 is a standard (street delivery) ZIP code serving Sinking Spring, Ohio, in Highland 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 45172 at a glance
| ZIP code | 45172 |
|---|---|
| Primary city | Sinking Spring |
| State | Ohio (OH) |
| County | Highland FIPS 39071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 308 |
| Coordinates | 39.074470, -83.386880 |
How ZIP+4 works in 45172
The four digits after the hyphen encode a delivery segment inside 45172. 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 45172 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 45172.
| ZIP | City | Distance |
|---|---|---|
| 45646 | Latham, OH | 3.8 mi |
| 45660 | Peebles, OH | 6.3 mi |
| 45624 | Cynthiana, OH | 7.1 mi |
| 45671 | Rarden, OH | 10.6 mi |
| 45612 | Bainbridge, OH | 11.5 mi |
| 45133 | Hillsboro, OH | 11.5 mi |
| 45679 | Seaman, OH | 11.8 mi |
| 45661 | Piketon, OH | 15.3 mi |
| 45681 | South Salem, OH | 17.6 mi |
| 45697 | Winchester, OH | 17.7 mi |
| 45642 | Jasper, OH | 17.9 mi |
| 45618 | Cherry Fork, OH | 17.9 mi |
Questions about 45172
What is the ZIP+4 code for 45172?
45172 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 45172, you need to look up a specific street address to get them.
What city is 45172?
45172 is assigned to Sinking Spring, Ohio, in Highland 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.