ZIP Code 43143 — Mount Sterling, OH
43143 is a standard (street delivery) ZIP code serving Mount Sterling, Ohio, in Madison 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 43143 at a glance
| ZIP code | 43143 |
|---|---|
| Primary city | Mount Sterling |
| State | Ohio (OH) |
| County | Madison FIPS 39097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 5,803 |
| Coordinates | 39.718010, -83.296720 |
How ZIP+4 works in 43143
The four digits after the hyphen encode a delivery segment inside 43143. 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 43143 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 43143.
| ZIP | City | Distance |
|---|---|---|
| 43117 | Derby, OH | 5.9 mi |
| 43106 | Bloomingburg, OH | 8.2 mi |
| 43146 | Orient, OH | 9 mi |
| 43126 | Harrisburg, OH | 9.3 mi |
| 43151 | Sedalia, OH | 9.6 mi |
| 43145 | New Holland, OH | 10.9 mi |
| 43116 | Commercial Point, OH | 13 mi |
| 43164 | Williamsport, OH | 13.2 mi |
| 43140 | London, OH | 13.5 mi |
| 43123 | Grove City, OH | 13.9 mi |
| 43153 | South Solon, OH | 14.5 mi |
| 43160 | Washington Court House, OH | 15.1 mi |
Questions about 43143
What is the ZIP+4 code for 43143?
43143 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 43143, you need to look up a specific street address to get them.
What city is 43143?
43143 is assigned to Mount Sterling, Ohio, in Madison 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.