Popes on Parade: Longest Reigning Popes
RankPopeElectionInstallationDeathLength
1Saint Peter- exact dates unknown -about 35 years
2Blessed Pius IX16 June 184621 June 184607 February 187831 years 7 months
3John Paul II the Great16 October 197822 October 197802 April 200526 years 6 months
4Leo XIII20 February 187803 March 187820 July 190325 years 5 months
5Pius VI15 February 177522 February 177529 August 179924 years 6 months
6Hadrian I01 February 77209 February 77225 December 79523 years 10 months
7Pius VII14 March 180021 March 180020 August 182323 years 5 months
8Alexander III07 September 115920 September 115930 August 118121 years 11 months 23 days
9Saint Sylvester I31 January 31431 December 33521 years 11 months
10Saint Leo I the Great29 September 44010 November 46121 years 1 month

Average length of a pontificate is about 7.5 years.

Complete List of Popes
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Twenty-First Century

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