In the title compound, {[Cu(C24H15N2O4)2(H2O)2]·4C3H7NO} n , the Cu(II) ion, lying on an inversion center, is six-coordinated by two N atoms from two 4-[6-(4-carb-oxy-phen-yl)-4,4'-bipyridin-2-yl]benzoate (L) ligands, two deprotonated carboxyl-ate O atoms from two other symmetry-related L ligands and two water mol-ecules in a slightly distorted octa-hedral geometry. The Cu(II) atoms are linked by the bridging ligands into a layer parallel to (101). The presence of intra-layer O-H⋯O hydrogen bonds and π-π inter-actions between the pyridine and benzene rings [centroid-centroid distances = 3.808 (2) and 3.927 (2) Å] stabilizes the layer. Further O-H⋯O hydrogen bonds link the layers and the dimethyl-formamide solvent mol-ecules.