Densities and surface tensions for the binary mixtures of 1,2,4-trimethylbenzene and 1,3,5-trimethylbenzene with isopropyl acetate and isobutyl acetate have been measured over the whole composition range. The measurements were made under normal atmospheric pressure and at the temperatures (298.15, 308.15, and 313.15) K. The excess molar volumes and surface tension deviations are derived from the experimental data. The excess molar volumes for all the binary systems are positive, and the surface tension deviations are negative.