The present study is a little further detailed extension of the application of both Hammett and Taft equations to fused ring systems like benzimidazolium cations. In the present study we brought a total of nineteen substituted benzimidazolium cations on one platform. We have applied Hammett and Taft equations to the dissociation equilibriums of deprotonation of these benzimidazolium cations. An excellent Hammett correlation is obtained using I values for 4 substituted compounds and normal  values for 5/6 substituted compounds. And Taft correlations are obtained in the case of 2-substituted benzimidazolium cations.