The density and viscosity data of three binary liquid mixtures containing the ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate and organic solvents, dimethylacetamide (DMAC), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) were obtained under atmospheric pressure, at temperatures of 303.15 to 333.15 K over the entire composition range. A vibrating-tube digital density meter and a capillary viscometer were used for density and viscosity measurements, respectively. Excess molar volumes (V-E) and viscosity deviations (Delta eta) for the binary mixture system were calculated from the experimental data and were satisfactorily fitted with the Redlich-Kister equation. Adding DMAC, DMF, and DMSO led to negative values of V-E and Delta eta. This finding revealed that the packing of the constituents was more efficient, and the anion cation interaction of IL was decreased in the binary liquid mixtures. The sequences of V-E and Delta eta for the three binary liquid mixtures in this study are also discussed using intermolecular interactions.