ZIP Code 45866 — Montezuma, OH
45866 is a standard (street delivery) ZIP code serving Montezuma, Ohio, in Mercer 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 45866 at a glance
| ZIP code | 45866 |
|---|---|
| Primary city | Montezuma |
| State | Ohio (OH) |
| County | Mercer FIPS 39107 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 117 |
| Coordinates | 40.489050, -84.549690 |
How ZIP+4 works in 45866
The four digits after the hyphen encode a delivery segment inside 45866. 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 45866 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 45866.
| ZIP | City | Distance |
|---|---|---|
| 45826 | Chickasaw, OH | 4.7 mi |
| 45822 | Celina, OH | 5 mi |
| 45828 | Coldwater, OH | 6.7 mi |
| 45860 | Maria Stein, OH | 6.8 mi |
| 45883 | Saint Henry, OH | 7.1 mi |
| 45869 | New Bremen, OH | 8.4 mi |
| 45885 | Saint Marys, OH | 10.3 mi |
| 45310 | Burkettsville, OH | 10.6 mi |
| 45351 | Osgood, OH | 10.7 mi |
| 45865 | Minster, OH | 11.4 mi |
| 45350 | North Star, OH | 11.4 mi |
| 45388 | Yorkshire, OH | 11.7 mi |
Questions about 45866
What is the ZIP+4 code for 45866?
45866 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 45866, you need to look up a specific street address to get them.
What city is 45866?
45866 is assigned to Montezuma, Ohio, in Mercer 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.