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