<P> Most of the figures are taken from the CIA Factbook or PEW Research Center Surveys . </P> <P> According to the CIA Factbook and the Pew Research Center, the five countries with the largest number of Catholics are, in decreasing order of Catholic population, Brazil, Mexico, the Philippines, the United States, and Italy . </P> <P> The country where the membership of the church is the largest percentage of the population is Vatican City at 100%, followed by East Timor at 97% . </P> <P> According to the Census of the 2017 Annuario Pontificio (Pontifical Yearbook), the number of Catholics in the world was about 1.285 billion at the end of 2015 . </P>

Which country has the largest catholic population in the world
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