| Nominativ | oblongus, oblongum, oblongum, oblonga, oblongus, oblonga | oblongae, oblongi, oblongae, oblongi, oblonga, oblonga |
| Genitiv | oblongi, oblongae, oblongi, oblongi, oblongi, oblongae | oblongorum, oblongarum, oblongorum, oblongarum, oblongorum, oblongorum |
| Dativ | oblongae, oblongae, oblongo, oblongo, oblongo, oblongo | oblongis, oblongis |
| Akkusativ | oblongam, oblongam, oblongum, oblongum, oblongum, oblongum | oblonga, oblongas, oblongos, oblongas, oblongos, oblonga |
| Ablativ | oblongo, oblongo, oblonga, oblongo, oblonga, oblongo | oblongis, oblongis |
| Vokativ | oblongum, oblonge, oblonge, oblongum, oblonga, oblonga | oblongae, oblongi, oblongae, oblongi, oblonga, oblonga |
