Longest-running Marvel Comics ongoings by team

By team as in the Avengers, the X-Men, the Fantastic Four and the Guardians of the Galaxy. Excludes legacy renumbering.

1. X-Men - The X-Men v1 / X-Men v1 / The All-New, All-Different X-Men / The Uncanny X-Men v1 / Uncanny X-Men v1 (September 1963 to December 2011, 544 issues)
2. Fantastic Four - The Fantastic Four v1 / Fantastic Four v1 (November 1961 to September 1996, 406 issues)
3. Avengers - The Avengers v1 / The Mighty vengers / Avengers v1 (September 1963 to September 1996, 402 issues)
4. New Warriors - The New Warriors v1 (July 1990 to September 1996, 75 issues)
5. Guardians of the Galaxy - Guardians of the Galaxy v1 (June 1990 to July 1995, 62 issues)
6. Ultimates - Ultimate Comics Ultimates (August 2011 to September 2013, 30 issues)
7. Champions - Champions v2 (December 2016 to February 2019, 27 issues)