ZIP Code 45164 — Port William, OH
45164 is a standard (street delivery) ZIP code serving Port William, 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 45164 at a glance
| ZIP code | 45164 |
|---|---|
| Primary city | Port William |
| State | Ohio (OH) |
| County | Clinton FIPS 39027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 175 |
| Coordinates | 39.553650, -83.785320 |
How ZIP+4 works in 45164
The four digits after the hyphen encode a delivery segment inside 45164. 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 45164 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 45164.
| ZIP | City | Distance |
|---|---|---|
| 45307 | Bowersville, OH | 3.8 mi |
| 45335 | Jamestown, OH | 6 mi |
| 45177 | Wilmington, OH | 6.9 mi |
| 45166 | Reesville, OH | 7.4 mi |
| 45169 | Sabina, OH | 7.9 mi |
| 45385 | Xenia, OH | 10.5 mi |
| 43142 | Milledgeville, OH | 10.9 mi |
| 45384 | Wilberforce, OH | 12.3 mi |
| 45032 | Harveysburg, OH | 12.4 mi |
| 43128 | Jeffersonville, OH | 13.3 mi |
| 45314 | Cedarville, OH | 13.3 mi |
| 45370 | Spring Valley, OH | 14.1 mi |
Questions about 45164
What is the ZIP+4 code for 45164?
45164 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 45164, you need to look up a specific street address to get them.
What city is 45164?
45164 is assigned to Port William, 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.