Before 2023 the gmina covered an area of 260.58 square kilometres (100.6 sq mi), and as of 31 December 2022 its total population was 18 145.
In 2023 the gmina lost 9.56 square kilometres (3.7 sq mi) of its area to the city of Słupsk.
[2] It was part of a political tension between the gmina and the city of Słupsk regarding the expansion of the municipal area.
The gmina contains part of the protected area called Słupia Valley Landscape Park.
Gmina Redzikowo contains the villages and settlements of Bierkowo, Bruskowo Małe, Bruskowo Wielkie, Bukówka, Bydlino, Gać, Gać Leśna, Gajki, Gałęzinowo, Głobino, Grąsino, Jezierzyce, Jezierzyce-Osiedle, Karżcino, Kępno, Krępa Słupska, Krzemienica, Kukowo, Kusowo, Łękwica, Lubuczewo, Łupiny, Miednik, Niewierowo, Płaszewko, Redęcin, Redzikowo, Redzikowo-Osiedle, Rogawica, Siemianice, Stanięcino, Strzelinko, Strzelino, Swochowo, Swołowo, Warblewko, Warblewo, Wielichowo, Wierzbięcin, Wieszyno, Wiklino, Włynkówko, Włynkowo, Wrzeście and Zamełowo.