We have prepared and characterized three coordination polymers formulated as Dy2(C6O4Cl2)3(fma)6 ⋅ 4.5fma (1) and Dy2(C6O4X2)3(fma)6 ⋅ 4fma ⋅ 2H2O with X=Br (2) and Cl (3), where fma=formamide and C6O4X22−=3,6‐disubstituted‐2,5‐dihydroxy‐1,4‐benzoquinone dianion with X=Cl (chloranilato) and Br (bromanilato). Compounds 1 and 3 are solvates obtained with slow and fast precipitation methods, respectively. Compounds 2 and 3 are isostructural and only differ in the X group of the anilato ligand. The three compounds present (6,3)‐gon two‐dimensional hexagonal honey‐comb structures. Magnetic measurements indicate that the three compounds show slow relaxation of the magnetization at low temperatures when a continuous magnetic field is applied, although with different relaxation times and energy barriers depending on X and the crystallisation molecules. Compounds 1–3 represent the first examples of anilato‐based lattices with formamide and field‐induced slow relaxation of the magnetization. The anilato‐based DyIII‐containing compounds formulated as Dy2(C6O4Cl2)3(fma)6 ⋅ 4.5fma (1) and Dy2(C6O4X2)3(fma)6 ⋅ 4fma ⋅ 2H2O, with X=Br (2) and Cl (3), prepared with formamide as coordinating solvent, are coordination polymers with a honey‐comb layered structure showing slow magnetic relaxation when a DC field is applied. Compounds 1 and 3 are solvates obtained with a slow and fast crystallization method, respectively. Compounds 2 and 3 are isostructural.