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The Archdiocese of Indianapolis (Latin: Archidioecesis Indianapolitana) is a Latin Church diocese of the Catholic Church in Indiana in the United States.
When it was originally erected as the Diocese of Vincennes on May 6, 1834, it encompassed all of Indiana as well as the eastern third of Illinois. It was renamed the Diocese of Indianapolis on March 28, 1898. Bishop Francis Chatard became the first bishop of Indianapolis. It was elevated from a diocese to a metropolitan archdiocese on October 21, 1944.As of the 2000 census, the archdiocese contained 2,430,606 people, 233,273 of whom were Catholic. The archdiocese covers 39 counties in central and southern Indiana, with a total area of 13,757 square miles. Charles Thompson has been the archbishop of Indianapolis since 2017.