The reactions of octacyanometallates [Mo^V(CN)₈]³⁻ and lanthanide ions in the solution of DMF (DMF = N,N-dimethylformamide) have yielded nine bimetallic coordination polymers: [Ln^III(DMF)₆Mo^V(CN)₈]_∞ [Ln = Pr(1), Nd(2), Sm(3), Eu(4), Gd(5), Ho(6), Er(7), Tm(8), Yb(9)]. All the coordination polymers consist of one-dimensional chains, in which [Ln^III(DMF)₆]³⁺ and [Mo^V(CN)₈]³⁻ ions link each other in an alternating fashion through the cyano-bridged coordination bonds. The variable-temperature magnetic susceptibility studies reveal the ferromagnetic interactions between Ln^III and Mo^V ions in compounds 3 and 4, while antiferromagnetic interactions are found in compounds 1, 2, and 5–9.