Display omitted •CoxMn0.5−xZn0.5Fe2O4 nanoferrites prepared by chemical Co-precipitation method.•Structure and magnetic properties were characterized by XRD and VSM respectively.•Magnetic results exhibited a super-paramagnetic behavior for some of the samples.•DC electrical resistivity were measured by two-probe technique at 25–250 °C range.•Thermal behavior of resistivity showed an abnormal peak near the Tc of each sample. In this study, Cobalt-Manganese-Zinc nanoferrites with the formula CoxMn0.5−xZn0.5Fe2O4 with x = 0.0, 0.1, 0.3, and 0.5 prepared by chemical Co-precipitation method. Then the structure and morphology of the synthesized nanoparticles were characterized by X-ray diffraction (XRD) and transmitting electron microscopy (TEM), respectively. The XRD patterns indicated the formation of single-phased cubic structure of spinel ferrite in nanometer size with no minor phase. The TEM image showed the formation of nanoparticles with average size of about 40 nm and normal size distribution. The magnetic measurements of the nanoparticles were done at room temperature using a vibrating sample magnetometer (VSM). Results exhibited a super-paramagnetic like behavior for some of the samples. DC electrical resistivity measurements were carried out by two-probe technique from 25 to 250 °C and showed decreasing of the resistivity with temperature meanwhile passing a transition to form of a peak. The peaks values observed near the Curie temperatures of samples suggest that anomaly behavior can attributed to spin canting associated with the phase transition from para to ferromagnetic state at TC.