The basic principles of systematization of market segments according to the degree of concentration and monopolization are stated. The analysis of 86 regional coal markets of Russia by the coefficient of market concentration and Herfindahl-Hirschman index is carried out. It has been established that there are two types of markets on the territory of Russia: with a moderate and high degree of concentration. Highly concentrated markets account for 57.3% of the total consumption of coal, while moderately concentrated markets account for 42.7%. There are no coal markets with a low degree of concentration.