Experimental data on the dielectric response of latex dispersions for a large variety of particle sizes, surface charge densities, and ionic strengths are interpreted using an analytical theory developed previously (Chassagne, C.; Bedeaux, D.; Koper, G. J. M. J. Phys. Chem. B 2001, 105, 11743 and Physica A 2002, 317, 321). It is found that the conductivity increment is a crucial variable in the discussion about the need of a Stern layer conductance. Both the dielectric permittivity and the conductivitty increments are fitted using the zeta potential and a Stern layer conductance.