| Singular | Plural | |
|---|---|---|
| Nominativ | nicomedia | nicomediae |
| Genitiv | nicomediai, nicomediae | nicomediarum, nicomedium |
| Dativ | nicomediai, nicomediae | nicomediis, nicomediabus |
| Akkusativ | nicomediam | nicomedias |
| Ablativ | nicomedia, nicomediad | nicomediis, nicomediabus |
| Vokativ | nicomedia | nicomediae |