In the present paper, densities, speeds of sound, and viscosities of four binary mixtures containing the ionic liquids 1-ethyl-3-methylimidazolium methylsulfate and 1-ethyl-3-methylimidazolium thiocyanate mixed with ethanol or 1-propanol were measured at 101.3 kPa in the range of (283.15-323.15) K along the whole composition range. From these experimental data, the excess molar volume and the excess isentropic compressibility of pure components and mixtures were calculated and satisfactorily fitted using the Redlich-Kister polynomial equation. It can be confirmed that the organic compounds have a strong effect on the thermophysical properties of the studied ionic liquids. An increase in the alkyl chain length of 1-alcohol resulted in an increase in the excess deviation of excess molar volume.