Kozani, administratively, functions as a municipality, from 1879. Up to then, it was recognized as community. The current Mayor is Lazaros Maloutas, since 2009.
The mayors of Kozani (1879 - 1912) - during the Ottoman domination
Nikolaos Chalkias (twice), Emmanouil M. Manos, Kotias Dardoufas, Nik. Rompapas (twice), Ioannis K. Govedaros (twice), Georgios Tsiminakis, Ioannis G. Govedaros, Georgios Handgiandreou (twice), Konstantinos A. Gagalis (twice), Stefanos G. Gortsoulis, Georgios Em. Manos, Nikolaos G. Armenoulis.
References
List of mayors of Kozani Wikipedia(Text) CC BY-SA