ZIP Code 45843 — Forest, OH
45843 is a standard (street delivery) ZIP code serving Forest, 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 45843 at a glance
| ZIP code | 45843 |
|---|---|
| Primary city | Forest |
| State | Ohio (OH) |
| County | Hardin FIPS 39065 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 4,184 |
| Coordinates | 40.782020, -83.535130 |
How ZIP+4 works in 45843
The four digits after the hyphen encode a delivery segment inside 45843. 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 45843 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 45843.
| ZIP | City | Distance |
|---|---|---|
| 45836 | Dunkirk, OH | 5.7 mi |
| 43330 | Kirby, OH | 6.4 mi |
| 45897 | Williamstown, OH | 7.3 mi |
| 43359 | Wharton, OH | 7.4 mi |
| 45867 | Mount Blanchard, OH | 8 mi |
| 45835 | Dola, OH | 8.8 mi |
| 45814 | Arlington, OH | 9.2 mi |
| 43326 | Kenton, OH | 10.5 mi |
| 45841 | Jenera, OH | 12.4 mi |
| 43351 | Upper Sandusky, OH | 12.4 mi |
| 45890 | Vanlue, OH | 13.7 mi |
| 43316 | Carey, OH | 14.1 mi |
Questions about 45843
What is the ZIP+4 code for 45843?
45843 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 45843, you need to look up a specific street address to get them.
What city is 45843?
45843 is assigned to Forest, 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.