The administrative reform implemented in Poland 20 years ago has created a new system of territorial units, with a smaller number of voivodship comprising a greater diversity of component units. It is since then that the Statistical Office in Poznań has published an annual volume providing a multifaceted picture of the current socio-economic situation of gminas and powiats of Wielkopolskie Voivodship, revealing the internal diversity of the voivodship. The current, twentieth edition of ”Wielkopolskie Voivodship. Subregions, Powiats, Gminas” presents data for 2018.