He relevance of creation`s task of suboptimum coverage zones of Kostroma city by subdivisions of EMERCOM of Russia in incident cases s shown. As a tool for solution, it is proposed to use methods and algorithms of applied mathematics together with geoinformation technologies. Step-by-step two-level clusterization of suboptimal zones of Kostroma city is done as an example. The boundaries of the zones of responsibility of the divisions of the Ministry of Emergencies of Russia have been clarified, the availability of socially significant and potentially dangerous objects for timely delivery of forces and means has been analyzed, remote objects have been identified.