| Onton | |
| Settlement Type: | Census-designated place (CDP) |
| Pushpin Map: | Kentucky |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location within the state of Kentucky |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kentucky |
| Subdivision Type2: | County |
| Subdivision Name2: | Webster |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.15 |
| Area Land Km2: | 2.14 |
| Area Water Km2: | 0.01 |
| Area Total Sq Mi: | 0.83 |
| Area Land Sq Mi: | 0.82 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 138 |
| Population Density Km2: | 64.58 |
| Population Density Sq Mi: | 167.27 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CST |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 476 |
| Coordinates: | 37.5578°N -87.4369°W |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank Info: | 21-58116 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2629659 |
Onton is a census-designated place (CDP) in Webster County, Kentucky, United States.