Stargate

1. Movie 1 - Stargate 10.28.94
Stargate SG-1 1997-2007 - 214 Episodes
2. SG-1 Season 1 (1997–1998) 22 episodes.
3. SG-1 Season 2 (1998–1999) 22 episodes.
4. SG-1 Season 3 (1999-2000) 22 episodes.
5. SG-1 Season 4 (2000-2001) 22 episodes.
6. SG-1 Season 5 (2001-2002) 22 episodes.
7. SG-1 Season 6 (2002-2003) 22 episodes.
0. Stargate Infinity (2002-2003) 26 animated episodes, incomplete unofficial storyline.
8. SG-1 Season 7 (2003-2004) 22 episodes. (This is as far as I watched)
9. SG-1 Season 8 (2004-2005) 20 episodes. W
Stargate Atlantis 2004-2009 ~80 - _ Episodes
10. Atlantis Season 1 (2004–2005) 20 episodes. W
11. SG-1 Season 9 (2005-2006) 20 episodes. W
12. Atlantis Season 2 (2005–2006) 20 episodes. W
13. SG-1 Season 10 (2006-2007) 20 episodes. (Ends) W
14. Atlantis Season 3 (2006–2007) 20 episodes. W
15. Atlantis Season 4 (2007–2008) 20 episodes. W
16. Movie (DVD) 2 - Stargate SG-1 The Ark of Truth 3.11.08
17. Movie (DVD) 3 - Stargate SG-1 Continuum 7.29.08
18. Atlantis Season 5 (2008–2009) _ episodes.
Stargate Universe 2009 new series?

Not counting Atlantis Season 5 on, there are 2 official series and 1 unofficial for a total of 294 episodes & 3 movies.