Iłownica was formerly part of the German Empire. In the German Empire, the place was called Illownitz.
The place is now called Iłownica and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Illownitz | Austro-Hungary | Bielitz/Bielsko | before the Treaty of Saint-Germain |
| Iłownica | Austro-Hungary | Bielitz/Bielsko | before the Treaty of Saint-Germain |
| Iłownica | Poland | Bielsko | after the Treaty of Saint-Germain |
| Illownitz | German Empire | Bielitz | 1939 |
| Iłownica | Poland | Bielsko-Biała | 1945 |
| Iłownica | Poland | Bielsko | 1992 |