2007 | 67 Episodes
Season 0 of It's Always Sunny in Philadelphia premiered on September 4, 2007.
2005 | 7 Episodes
Season 1 of It's Always Sunny in Philadelphia premiered on August 4, 2005.
2006 | 10 Episodes
Season 2 of It's Always Sunny in Philadelphia premiered on June 29, 2006.
2007 | 15 Episodes
Season 3 of It's Always Sunny in Philadelphia premiered on September 13, 2007.
2008 | 13 Episodes
Season 4 of It's Always Sunny in Philadelphia premiered on September 18, 2008.
2009 | 12 Episodes
Season 5 of It's Always Sunny in Philadelphia premiered on September 17, 2009.
2010 | 13 Episodes
Season 6 of It's Always Sunny in Philadelphia premiered on September 16, 2010.
2011 | 13 Episodes
Season 7 of It's Always Sunny in Philadelphia premiered on September 15, 2011.
2012 | 10 Episodes
Season 8 of It's Always Sunny in Philadelphia premiered on October 11, 2012.
2013 | 10 Episodes
Season 9 of It's Always Sunny in Philadelphia premiered on September 4, 2013.
2015 | 10 Episodes
Season 10 of It's Always Sunny in Philadelphia premiered on January 14, 2015.
2016 | 10 Episodes
Season 11 of It's Always Sunny in Philadelphia premiered on January 6, 2016.
2017 | 10 Episodes
Season 12 of It's Always Sunny in Philadelphia premiered on January 4, 2017.
2018 | 10 Episodes
Season 13 of It's Always Sunny in Philadelphia premiered on September 5, 2018.
2019 | 10 Episodes
Season 14 of It's Always Sunny in Philadelphia premiered on September 25, 2019.
2021 | 8 Episodes
Season 15 of It's Always Sunny in Philadelphia premiered on December 1, 2021.
2023 | 8 Episodes
Season 16 of It's Always Sunny in Philadelphia premiered on June 7, 2023.
2025 | 8 Episodes
Season 17 of It's Always Sunny in Philadelphia premiered on July 9, 2025.
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