The electrical conductivities of aqueous solutions of cobalt sulfate, copper sulfate, cadmium sulfate, manganese sulfate, nickel sulfate, and zinc sulfate have been measured as a function of concentration, m = (0.005 to 2.5) mol center dot kg(-1), and temperature, T = (278.15 to 308.15) K. Densities were measured for all electrolyte solutions at 298.15 K, and the molar conductivities are reported. The conductivity data were analyzed by the empirical Casteel-Amis equation.