The Ukrainian Greek Catholic Church is the largest Eastern Catholic Church in the world. Currently it has approximately 4.1 million members. Within Ukraine itself, the UGCC is the second largest religious organization in terms of number of communities within the Catholic church. In terms of number of members, the Ukrainian Greek Catholic Church ranks third in allegiance among the population of Ukraine after the Ukrainian Orthodox Church (Moscow Patriarchate) and the Orthodox Church of Ukraine. Currently, the Ukrainian Greek Catholic Church predominates in three western oblasts of Ukraine, including the majority of the population of Lviv, but constitutes a small minority elsewhere in the country. The church has followed the spread of the Ukrainian diaspora and now has some 40 hierarchs in over a dozen countries on four continents, including three other metropolitan bishops in Poland, the United States, and Canada.