| Name | İzṁit |
| Alt names | Astacus | source: Encyclopædia Britannica (1988) VI, 448 |
| Izmit | source: Columbia Lippincott Gazetteer (1961) |
| Kocael̇i | source: Rand McNally Atlas (1994) I-88 |
| Nicomedia | source: Encyclopædia Britannica (1988) VI, 448; GRI Photo Archive, Authority File (1998) p 10112; Princeton Encyclopedia of Classical Sites (1979) |
| Nikomedeia | source: GRI Photo Study, Authority File (1989) |
| Olbia | source: Encyclopædia Britannica (1988) VI, 448 |
| Type | Inhabited place |
| Coordinates | 40.783°N 29.917°E |
| Located in | Kocaeli, Turkey |
