| Nominativ | congressus, congressusque, congressus | congressus, congressuus, congressus, congressuus, congressusque |
| Genitiv | congressus, congressusque, congressus | congressuum, congressuum |
| Dativ | congressui, congresui, congressui | congressubus, congressibus, congressibus, congressubus |
| Akkusativ | congressum, congressum | congressus, congressuus, congressus, congressuus, congressusque |
| Ablativ | congressuque, congressu, congressu | congressubus, congressubus, congressibus, congressibus |
| Vokativ | congressus, congressusque, congressus | congressus, congressuus, congressus, congressuus, congressusque |
