Opole Voivodeship was created on January 1, 1999, out of the former Opole Voivodeship and parts of Częstochowa Voivodeship, pursuant to the Polish local government reforms adopted in 1998.
The solution came in late 1999, when Olesno was, after 24 years apart, finally reunited with the Opole Voivodeship to form the new legally defined region.