The YMnO3 oxide, crystallizing in the P6(3)cm space group is one of the most studied multiferroic material. While these properties can be modified by substitutions at the Mn-site, the peculiar fivefold coordination appears to limit the M solubility range in YMn1-xMxO3. This motivated the preparation by solid state reaction of several series of co-substituted YMn1-x(M',M '')(x)O-3, which were studied using both powder X-ray diffraction and transmission electron microscopy. The cation pairs have been chosen for their ability to adopt a fivefold coordination similar to that of Mn3+ in YMnO3, to keep a constant average trivalent oxidation state and to maintain an average cationic radius similar to that of Mn3+. For YMn1-x(Cu1/2Ti1/2)(x)O-3, a complete solid solution is observed without cation ordering. For all other studied cation pairs, the solubility range is always reaching a minimum value of 25% for the Zn containing pairs (Zn2/3V1/3 and Zn3/4Mo1/4), a maximum of 50% being reached for the Cu containing pairs (Cu2/3V1/3, Cu2/3Nb1/3 and Cu3/4W1/4). Interestingly, the non-centrosymmetric P6(3)cm space group is retained within the solubility range without generating cation ordering phenomena. These co-substitutions at the Mn3+ are found to induce a decrease of the antiferromagnetic ordering temperature, the T-N variations being similar to the temperature decrease of the dielectric anomaly. Thus, these oxides are interesting candidates for the study of the multiferroic behavior of YMnO3 derivatives. (C) 2012 Elsevier Ltd. All rights reserved.