| Singular | Plural | |
|---|---|---|
| Nominativ | castraque, castra | castrae |
| Genitiv | castrae, castrai | castrarum |
| Dativ | castrae, castrai | castris, castrisque, castrabus |
| Akkusativ | castram | castras |
| Ablativ | castrad, castraque, castra | castrabus, castris, castrisque |
| Vokativ | castraque, castra | castrae |
