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The title complex, {[Co2(C9H4N2O4)2(H2O)4]·3H2O}n, was synthesized hydrothermally. The unique CoII ion is coordinated in a distorted octahedral coordination environment by two water molecules and three symmetry-related 1H-benzimidazole-5,6-dicarboxylate (Hbidc) ligands. The Hbidc ligands coordinate via a bis-chelating and mono-chelating carboxylate group and by an imidazole group N atom, bridging the CoII ions and forming an extended two-dimensional structure in the ab plane. In the crystal structure, intermolecular N—H...O and O—H...O hydrogen bonds connect complex and solvent water molecules, forming a three-dimensional supermolecular network. One of the solvent water molecules lies on a twofold rotation axis.