ZIP Code 45812 — Alger, OH
45812 is a standard (street delivery) ZIP code serving Alger, Ohio, in Hardin 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 45812 at a glance
| ZIP code | 45812 |
|---|---|
| Primary city | Alger |
| State | Ohio (OH) |
| County | Hardin FIPS 39065 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,027 |
| Coordinates | 40.683410, -83.813500 |
How ZIP+4 works in 45812
The four digits after the hyphen encode a delivery segment inside 45812. 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 45812 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 45812.
| ZIP | City | Distance |
|---|---|---|
| 45859 | Mcguffey, OH | 1.6 mi |
| 45850 | Harrod, OH | 5.7 mi |
| 45810 | Ada, OH | 6.5 mi |
| 43346 | Roundhead, OH | 7.5 mi |
| 45835 | Dola, OH | 7.9 mi |
| 45896 | Waynesfield, OH | 8.4 mi |
| 45854 | Lafayette, OH | 8.9 mi |
| 43310 | Belle Center, OH | 10.4 mi |
| 43326 | Kenton, OH | 10.8 mi |
| 45870 | New Hampshire, OH | 11.4 mi |
| 45836 | Dunkirk, OH | 11.7 mi |
| 43331 | Lakeview, OH | 12.7 mi |
Questions about 45812
What is the ZIP+4 code for 45812?
45812 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 45812, you need to look up a specific street address to get them.
What city is 45812?
45812 is assigned to Alger, Ohio, in Hardin 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.