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The CoII atom in the title complex, {[Co(C10H8N2)(H2O)4](C8H4O4)}n, is coordinated by two N atoms of two bipyridine ligands and four O atoms of four water molecules in an octahedral geometry. The one-dimensional [Co(C10H8N2)(H2O)4]2+ cation chain is further extended into a supramolecular network via O–H...O hydrogen-bond interactions. The Co atom lies on a twofold rotation axis; another twofold rotation axis passes through the carboxylate carbon atoms and the attached ring C atoms.