The densities of dilute solutions of three electrolytes (NaI, NaBPh4 and Ph4PI) in methanol mixtures with propylene carbonate (PC), N,N-dimethylformamide (DMF) and acetonitrile (AN) have been measured by Anton Paar 5000 densimeter at T = 298.15 K. Apparent molar volumes, V-Phi have been determined at an electrolyte concentration of 0.06 mol center dot kg (1) over the entire mixed solvent composition range. Single ionic apparent molar volumes of transfer, Delta V-t(Phi) (ion) were calculated using the tetraphenylphosphonium tetraphenylborate (TPTB) assumption. The results are discussed in terms of ionic preferential solvation. (C) 2014 Elsevier Ltd. All rights reserved.