Nuclear level densities and thermodynamic functions have been determined for light A nuclei, from a microscopic theory, which includes nuclear pairing interaction. Nuclear level densities have also been obtained using Bethe formula as well as constant temperature formula. Level densities extracted from the theories are compared with their corresponding experimental values. It is found that the nuclear level densities deduced by considering various statistical theories are comparable; however, the Fermi-gas formula becomes inadequate at higher excitation energies. This conclusion, which has also been arrived at by other investigations, reveals that a realistic treatment of the statistical nuclear properties requires the introduction of residual interaction. The effects of the pairing interaction and deformation on nuclear state densities are illustrated and discussed.