The article is devoted to the analysis of the grammatical system of the agglutinative (Mari, Tatar and Chuvash) languages and the fusional language (Russian) of the peoples living in the Urals-Volga region in the context of typological features and taking into account their differentiative and integrating factors. The Mari forms in comparison with the Russian and Tatar ones given together with the Russian transla-tion for both Mari and Tatar have been taken as reference points. In addition, it has been considered appropriate to include into the article composition such areas where the Mari language material trans-positions with the Chuvash one while saving the same conditions for their illustrations. The comparative analysis of the linguistic features of the Mari, Tatar and Russian languages is performed at the synchronic level together with the excursions into the characteristics of diachronic areal language phenomena.