The KWP claimed a membership of more than 3 million persons as of 1988, a significant increase from the 2 million members announced in 1976. This increase may have been a result of the active mobilization drive for the Three Revolution Team Movement.

The Korean Workers' Party has three constituencies: industrial workers, peasants, and intellectuals, that is, office workers. Since 1948 industrial workers have constituted the largest percentage of party members, followed by peasants and intellectuals. Beginning in the 1970s, when North Korea's population reached the 50 percent urban mark, the composition of the groups belonging to the party changed. More people working in state-owned enterprises became party members and the number of members working in agricultural cooperatives decreased.

Data as of June 1993