Present [1392] Stories that take place during the current run of the show.
Episode Related [915] Fic that takes place during or is closely tied to a specific episode.
Past [404] Stories that take place pre-series.
Crossover [30] Crossovers with other shows.
Future [627] Stories that take place far in the future - not post-Casino Night fic, but fic that's farther down the road
Alternate Universe [463] Alternate universes, with premises dramatically different from the show as it stands; for instance, Jim never came to work at Dunder Mifflin.