Where to start the Attack on Titan manga after the anime

Give it the last episode you watched. The mappings cover whole seasons. At a season boundary, the answer gives the next unread chapter; within a season, it gives a conservative starting point that may repeat material.

Every span the anime adapts

One row per season or film: the episodes, the chapters they adapt, and a note on where the boundary falls.

AnimeEpisodesChaptersNote
Attack on Titan Season 11–251–34Wikipedia's season 1 article states chapters 1 to 34. Episode 25 closes on the Titan found inside Wall Sina, which is the last chapter of Vol. 8, and season 2 opens on the chapter after it.
Attack on Titan Season 226–3735–51Wikipedia's season 2 article states chapters 35 to 51. Episode 37 reaches into chapter 51 and season 3 then adapts that chapter again from its beginning, so both rows carry it.
Attack on Titan Season 3 Part 138–4951–72The Royal Government arc, chapters 51 to 72. Wikipedia gives the arc range for the season as a whole; the boundary between the two parts is fixed by episode 49, which takes its title from chapter 72.
Attack on Titan Season 3 Part 250–5973–90The Return to Shiganshina arc, chapters 73 to 90. Episode 50 takes its title from chapter 73, and episode 59 ends on chapter 90, which is also where Vol. 22 ends.
Attack on Titan: The Final Season Final Season Part 160–7591–116The Marley arc and the opening of War for Paradis. Wikipedia gives chapter ranges for the season as a whole; the part boundary is fixed by episode 75, which takes its title from chapter 116, and episode 76, which takes its title from chapter 117.
Attack on Titan: The Final Season Final Season Part 276–87117–130Chapters 117 to 130. Episode 87 takes its title from chapter 130 and episode 88 from chapter 131, so this part ends where Vol. 32 ends.
Attack on Titan: The Final Season Final Season Part 3 (The Final Chapters)88–94131–139The two concluding specials, later redistributed as episodes 88 to 94. Episode 88 takes its title from chapter 131 and episode 94 from chapter 139, the last chapter of the series.

Every Attack on Titan volume, with its chapters