ZIP Code 45723 — Coolville, OH
45723 is a standard (street delivery) ZIP code serving Coolville, Ohio, in Athens 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 45723 at a glance
| ZIP code | 45723 |
|---|---|
| Primary city | Coolville |
| State | Ohio (OH) |
| County | Athens FIPS 39009 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,682 |
| Coordinates | 39.221730, -81.826800 |
How ZIP+4 works in 45723
The four digits after the hyphen encode a delivery segment inside 45723. 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 45723 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 45723.
| ZIP | City | Distance |
|---|---|---|
| 45783 | Tuppers Plains, OH | 3.3 mi |
| 45739 | Hockingport, OH | 4.8 mi |
| 45735 | Guysville, OH | 5.5 mi |
| 45772 | Reedsville, OH | 5.6 mi |
| 45742 | Little Hocking, OH | 6.8 mi |
| 26181 | Washington, WV | 8.3 mi |
| 45778 | Stewart, OH | 9.4 mi |
| 45743 | Long Bottom, OH | 10.1 mi |
| 45720 | Chester, OH | 10.2 mi |
| 45776 | Shade, OH | 10.7 mi |
| 26133 | Belleville, WV | 11 mi |
| 45724 | Cutler, OH | 11.2 mi |
Questions about 45723
What is the ZIP+4 code for 45723?
45723 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 45723, you need to look up a specific street address to get them.
What city is 45723?
45723 is assigned to Coolville, Ohio, in Athens 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.