The synthesis, crystal structures and magnetic properties of five new manganese compounds are reported. These include a linear trinuclear cluster [Mn(II)₃(O₂CCHMe₂)₆(dpa) ₂]·2MeCN (1) (dpa = 2,2′-dipyridylamine), a tetranuclear cluster [Mn(II)₂Mn(III)₂O₂(O ₂CCMe₃)₆(bpy)₂] (3) (bpy = 2,2′-bipyridine), and chain coordination polymers composed of cluster blocks such as Mn₃, Mn₃O, and Mn₄O₂ bridged by 2,2′-bipyrimidine (bpm) or hexamethylentetramine (hmta) ligands to give ([Mn(II)₃(O₂CCHMe₂) ₆(bpm)]·2EtOH)_n (2), [Mn(II)₂Mn(III) ₂O₂(O₂CCHMe₂)₆(bpm)(EtOH) ₄]_n (4), and (([Mn(II)Mn(III)₂O(O ₂CCHMe₂)₆(hmta)₂]·EtOH) _n (5). The magnetic analysis of the compounds was achieved using a combination of vector coupling and full-matrix diagonalization methods. Susceptibility data for compound 1 was fitted using a vector coupling model to give g = 2.02(1) and 2J/k_B = -5.38(2) K. To model the trimer chain, we used vector coupling for initial values of J₁ and then diagonalization techniques to estimate J₂ to give g = 1.98(1), 2J₁/k_B = -3.3(1) K and 2J₂/k_B = -1.0(1) K by approximating the system to a dimer of trimers. The analysis of 3 was made difficult by the mixture of polymorphs and the difficulties of a three-J model, while for 4 an analysis was not possible because of the size of the computation and the relative magnitudes of the three couplings. Compound 5 was modeled using the same techniques as 2 to give g = 1.99(1), 2J ₁/k_B = +32.5(2) K, 2J₂/k_B = -16.8(1) K, and 2J₃/k_B = +0.4(1) K. The combination of techniques has worked we