Ultrasonic investigations of some polymeric materials such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, and polyethylene glycol at 303 K have been done using ultrasonic velocity and density data taken from the literature. Various acoustical parameters such as molar sound velocity, molar adiabatic compressibility, acoustic impedance, van der Waal’s constant, molar sound volume, free volume, internal pressure, and cohesive energy have been determined. A large number of thermodynamical parameters such as molar volume, available volume, geometrical volume, intermolecular free length, relative association, and surface tension have been evaluated. Jacobson’s free length theory and Schaaff’s collision factor theory have been used to predict the values of ultrasonic velocities in the systems under study. The obtained results have been compared with the experimental results available in literature. The variation of acoustical and thermodynamical parameters of these polymeric materials, with change in their molecular weight, provide a deep insight into the intermolecular interactions going on in these systems.