Densities, ρ, of the binary mixtures of dimethylcarbonate with chloroethanes, namely, 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2,2-tetrachloroethane or chlororethenes, namely, trichloroethylene, and tetrachloroethylene have been measured as a function of the composition of dimethylcarbonate at 298.15 K and atmospheric pressure, using an Anton Parr model DMA 4500 oscillating U-tube densitometer. From the experimental results, excess molar volumes and partial molar volumes , were calculated. Limiting partial molar volumes , are also calculated by extrapolation of partial molar volumes to infinite dilution. The excess molar volumes are positive for tetrachloroethylene, 1,2-dichloroethane, trichloroethylene, and 1,1,1-trichloroethane and negative for 1,1,2,2-tetrachloroethane in the entire composition range of dimethylcarbonate. For all mixtures, these results were satisfactorily correlated by the Redlich–Kister polynomial. The results are explained in terms of dissociation of the self-associated chloroethanes or chloroethene molecules and the formation of aggregates between unlike molecules.