At the time of its formation, the PKN consisted of roughly 2,000 congregations with a membership of some 2,300,000, about 15% of the Dutch population. After the Roman Catholic Church, it is the second largest church body in the Netherlands. The PKN has four different types of congregations: Lutheran congregations are special in that they are federated in a separate Lutheran Synod, which is an autonomous synod within the PKN. The Lutheran Synod also has representatives in the PKN Synod.