I have the cast members in order in which they appear in the credits. Guest stars (only the recurring characters) are listed after the cast with "*" indicating they are not a cast member yet. I've gone through every episode (of the first 2 DVD seasons). If they are not listed for that episode that means they are not in that episode.

1. "Pilot"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

2. "On the Fence"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

3. "Father Knows Less"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

4. "Cory's Alternative Friends"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

5. "Killer Bees"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

6. "Boys II Mensa"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

7. "Grandma Was a Rolling Stone"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

8. "Teacher's Bet"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

9. "Class Pre-Union"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

10. "Santa's Little Helper"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

11. "The Father/Son Game"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

12. "Once In Love With Amy"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

13. "She Loves Me, She Loves Me Not"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

14. "The B-Team of Life"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

15. "Model Family"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence
*Jason Marsden as Jason Marsden

16. "Risky Business"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

17. "The Fugitive"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

18. "It's a Wonderful Night"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden

19. "Kid Gloves"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

20. "The Play's the Thing"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

21. "Boy Meets Girl"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

22. "I Dream of Feeny"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lee Norris as Stuart Minkus
Lily Nicksay as Morgan Matthews
William Russ as Alan Matthews

*Danielle Fishel as Topanga Lawrence

23. "Back 2 School"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

24. "Pairing Off"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

25. "Notorious"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino
*Jason Marsden as Jason Marsden
*Bob Larkin as Janitor Bud

26. "Me and Mr. Joad"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden

27. "The Uninvited"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

28. "Who's Afraid of Cory Wolf?"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

29. "Wake Up, Little Cory"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Bob Larkin as Janitor Bud

30. "Band on the Run"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

31. "Fear Strikes Out"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

32. "Sister Theresa"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

33. "The Beard"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

34. "The Turnaround"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

35. "Cyrano"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Danny McNulty as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

36. "I Am Not A Crook"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

37. "Breaking Up Is Really, Really, Really Hard To Do"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden

38. "Danger Boy"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

39. "On the Air"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

40. "By Hook Or By Crook"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden

41. "The Wrong Side Of the Tracks"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Kenny Johnston as Harley Keiner
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino
*Jason Marsden as Jason Marsden

42. "Pop Quiz"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Adam Scott as Griff Hawkins
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

43. "The Thrilla' In Philla' "
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Adam Scott as Griff Hawkins
*Blake Soper as Joey Epstein
*Ethan Suplee as Frankie Stecchino

44. "Career Day"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Danielle Fishel as Topanga Lawrence
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden
*Blake Clark as Chet Hunter

45. "Home"
Ben Savage as Cory Matthews
William Daniels as Mr. George Feeny
Betsy Randle as Amy Matthews
Will Friedle as Eric Matthews
Rider Strong as Shawn Hunter
Lily Nicksay as Morgan Matthews
Anthony Tyler Quinn as Mr. Jonathan Turner
William Russ as Alan Matthews

*Jason Marsden as Jason Marsden
*Blake Clark as Chet Hunter

Actors that don't make it past the first two seasons.
Lee Norris (Gone after year 1) With a guest spot in year 5.
Jason Marsden (Gone after year 2)
Lily Nicksay (Gone after year 2)
Danny McNulty (Gone after year 2) With a guest spot in year 3.

Yep, I guess that's right.

So out of the first two season, 45 episodes:

Danielle Fishel (Topanga) is in 27 scattered episodes.

Jason Marsden (Jason) is in only 9 episodes.

Blake Clark (Chet Hunter) is in only 2 episodes.

Harley Keiner and his lackies are in:

Danny McNulty as Harley is in 7 episodes.
Blake Soper as Joey is in 11 episodes.
Ethan Suplee as Frankie is in 10 episodes.
Kenny Johnston as "Fake Harley" is in 1 episode.
Adam Scott as Griff is in 2 episodes.

Frankie was the funniest "lackie"... Out of him, Joey, Harley and Griffin, he always seemed to have the low-key yet very funny lines