Co_1-yZn_yFe₂O₄; y = 0.00, 0.11, 0.22, 0.33, 0.44, and 0.55 nanoparticles system synthesized by coprecipitation technique. X-ray data show that both the average crystallite size and the average lattice parameter of Co_1-yZn_yFe₂O₄ system increase from 32 to 53 nm and from 0.839 to 0.841 nm respectively with increasing Zn²⁺ ions concentration (y). SEM images of Co_1-yZn_yFe₂O₄ system show that the nanoparticles are nearly spherical agglomerated and their morphology was affected by Zn amount (y). σ_DC of all Co_1-yZn_yFe₂O₄ samples was found to be dependent on the temperature, where σ_DC increases linearly with increasing T (K). The increase in σ_DC with the increase in T(K) showed the semiconducting nature of the Co_1-yZn_yFe₂O₄ system. The increase in σ_DC by increasing T (K) can be due to thermally activated drift mobility of charge carriers according to hopping conduction mechanism of charge carriers between multivalent ions.