Abstract: Correlated scattering of very dense(fractional volume more than 0.4) randomly distributed spherical particles is studied. A Monte Carlo method and a random shuffling process are employed to generate the very dense and randomly distributed particles. With solution of the volumetric integral equation of the electric fields, the scattering, absorption and extinction coefficients, as well as effective permittivity of the very dense and randomly distributed spherical particles are numerically calculated. For a validation purpose, they are compared with other approaches such as QCA, QCA-CP and Maxwell-Garnett mixing formula at lower fractions. It shows that very dense particles demonstrate particles clustering and enhance the scattering of bigger or clustered particles.