The crystal structure of new Prussian blue analogue samples, KCu[Fe1-x Co-x(CN)(6)], KNi[Fe1-x Co-x(CN)(6)] and Fe[Fe1-x Co-x(CN)(6)], was solved on the base of the model from Keggin and Miles [1] and refined by the Rietveld method [2] from conventional X-ray powder diffraction data. These compounds form mixed crystals for all Fe/Co ratios. The crystal structure of the KCu[Fe0.3Co0.7(CN)(6)], KNi[Fe0.3Co0.7(CN)(6)] and Fe[Fe0.8Co0.2(CN)(6)] is presented in detail. For both potassium containing compounds the disorder in the potassium arrangement is the most obvious characteristic.