| Official Name: | Clarktown, Ohio |
| Settlement Type: | CDP |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Scioto |
| Subdivision Type3: | Township |
| Subdivision Name3: | Jefferson |
| Unit Pref: | Imperial |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 911 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 666 |
| Coordinates: | 38.8497°N -82.9086°W |
| Postal Code Type: | ZIP code |
| Area Code: | 740, 220 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2633226 |
Clarktown is an unincorporated community and census-designated place in southeastern Jefferson Township, Scioto County, Ohio, United States. As of the 2020 census it had a population of 911.
Located at the intersection of State Route 139 with Burns Hollow and Blue Run roads, it lies 5miles southeast of Lucasville and northeast of the city of Portsmouth, the county seat of Scioto County. Long Run, a tributary of the Rocky Fork of the Little Scioto River, flows past the community.[2]