Voronoi-Dirichlet polyhedra (VDP) and the intersecting sphere method were used to perform coordination analysis of 204 crystallographically different gallium atoms in the structures of all known compounds containing GaS n polyhedra. The Ga(III) atoms in crystal structures were found to be linked to 6, 4, or three sulfur atoms to form coordination octahedra, tetrahedra, and triangles, respectively, whereas Ga(II) atoms are bound only to three sulfur atoms and a gallium atom. The effect of the valence state and the coordination number of gallium atoms on the key parameters of the VDP is considered. A common linear dependence of the solid angles of the VDP faces corresponding to the Ga-S bonds on the corresponding interatomic distances, which vary from 2.09 to 2.53 Å, was established to exist.