Most Roman Catholics in California are of Mexican, Central American, Irish, German, Italian, Vietnamese, Filipino and Korean ancestry. The population of Catholic Californians is rapidly growing due to the influx of Latin American, Asian, African and Middle Eastern Christian immigrants. In the Archdiocese of Los Angeles, Sunday Mass is celebrated in 42 different languages representing more than 30 ethnic groups from around the world. The Roman Catholic dioceses of Orange, Los Angeles and San Jose have the largest Catholic diaspora of Vietnamese Roman Catholics in world outside of Vietnam, estimated to be about 250,000-300,000 Roman Catholics out of a total Vietnamese California population of 1.3 Million.