Variations in crystallization conditions produce dramatic changes in the composition and geometry of solvated porphyrin-fullerene cocrystals. The products obtained by cocrystallization from a benzene solution of C60 with a solution of MII(OEP) (M = Co or Zn) in a variety of solvents have been analyzed crystallographically. The cocrystals fall into three categories: Class 1, ordered crystals with a 1:1 porphyrin/fullerene ratio (CoII(OEP)·C60·CS2 (1), ZnII(OEP)­·C60·CS2 (2), CoII(OEP)­·C60·C4H8O2 (5), CoII(OEP)­·C60·1.5C6H6 (8); Class 2, ordered crystals with a 2:1 porphyrin/fullerene ratio (2ZnII(OEP)­·C60·0.75CCl4 (4) and 2CoII(OEP)­·C60·C4H8O (7)); and Class 3, crystals involving a five-coordinate metal and a disordered fullerene cage (ClCoIII(OEP)­·C60·CCl4 (3) and (C4H8O2)­ZnII(OEP)­·C60·C4H8O2 (6)). Class 1 crystals form in three different space groups, yet all contain two packing motifs: columns with significant porphyrin/porphyrin, fullerene/porphyrin, and fullerene/fullerene interactions and zigzag chains of fullerenes. Class 2 crystals are isostructural. Class 3 crystals vary due to differing axial ligands. Whether crystals with a 1:1 or 2:1 porphyrin/C60 ratio form depends upon the solvent rather than the amounts of components present in solution. Cocrystallization using ZnII(OEP) and chlorinated solvents appears as the preferred combination to produce ordered C60 molecules, and this situation may pertain for other fullerenes.