Vapor pressures p of ZnBr2 + CH3OH and ZnCl2 + CH3OH solutions at T = (298.15 to 323.15) K were measured, activity of solvent a(s) and osmotic phi coefficients have been evaluated. The experiments were carried out for the ZnBr2 + CH3OH solutions in the molality range m = (0.19972 to 11.05142) mol . kg(-1) and for the ZnCl2 + CH3OH solutions in the molality range m = (0.42094 to 8.25534) mol . kg(-1). The Antoine equation for the empirical description of the experimental vapor pressure results and the Pitzer-Mayorga model with inclusion of ionic strength dependence of the third virial coefficient for the description of calculated osmotic coefficients were used. The parameters of Pitzer-Mayorga model were used for evaluation of activity coefficients. (C) 2005 Elsevier Ltd. All rights reserved.