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| Name | Latitude | Longitude | Diameter | Added | Origin |
| Argos Planum | 47.0S | 318.2W | 140.0 | 1985 | Where Io was captured by Zeus |
| Danube Planum | 20.9S | 258.7W | 150.0 | 1985 | Where Io passed by in her wanderings |
| Dodona Planum | 56.8S | 352.9W | 390.0 | 1979 | Greek; where Io went after the death of Argus |
| Ethiopia Planum | 44.9S | 27.0W | 105.0 | 1985 | Where Io passed by in her wanderings |
| Hybristes Planum | 54.0S | 21.1W | 150.0 | 1985 | Where Io passed by in her wanderings |
| Iopolis Planum | 34.5S | 333.5W | 125.0 | 1985 | Town where Io was worshipped as moon goddess (present-day Antioch) |
| Lyrcea Planum | 40.3S | 269.3W | 310.0 | 1985 | Plain where Io was born |
| Nemea Planum | 73.3S | 275.5W | 500.0 | 1979 | Greek; where Io was turned into a cow by Zeus and given to Hera |
