ZIP Code 45054 — Oregonia, OH
45054 is a standard (street delivery) ZIP code serving Oregonia, Ohio, in Warren 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 45054 at a glance
| ZIP code | 45054 |
|---|---|
| Primary city | Oregonia |
| State | Ohio (OH) |
| County | Warren FIPS 39165 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,693 |
| Coordinates | 39.438440, -84.074180 |
How ZIP+4 works in 45054
The four digits after the hyphen encode a delivery segment inside 45054. 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 45054 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 45054.
| ZIP | City | Distance |
|---|---|---|
| 45113 | Clarksville, OH | 5.4 mi |
| 45032 | Harveysburg, OH | 5.7 mi |
| 45068 | Waynesville, OH | 6.2 mi |
| 45152 | Morrow, OH | 6.6 mi |
| 45036 | Lebanon, OH | 7.7 mi |
| 45065 | South Lebanon, OH | 8.8 mi |
| 45034 | Kings Mills, OH | 10.8 mi |
| 45066 | Springboro, OH | 11 mi |
| 45039 | Maineville, OH | 11.6 mi |
| 45162 | Pleasant Plain, OH | 11.7 mi |
| 45107 | Blanchester, OH | 11.7 mi |
| 45370 | Spring Valley, OH | 11.9 mi |
Questions about 45054
What is the ZIP+4 code for 45054?
45054 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 45054, you need to look up a specific street address to get them.
What city is 45054?
45054 is assigned to Oregonia, Ohio, in Warren 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.