The following is a complete list of cast members which includes both featured and repertory players. The dates given are the dates of the season in which they first appeared as a player and the season when they left. Cast members who were only featured (never promoted to contract player) are marked with an (F). The original cast are listed in alphabetical order and all subsequent cast members are listed in chronological order.
| Cast Member | First Cast Appearance | Last Cast Appearance | Last Guest Appearance | Season | Total Seasons | Total Guest Appearances | Total Episodes |
| Craig Anton (F) | October 14, 1995 | December 13, 1997 | None | 1–3 | 3 | None | |
| October 14, 1995 | May 17, 1997 | None | 1–2 | 2 | None | 42 | |
| October 14, 1995 | December 13, 1997 | None | 1–3 | 3 | None | ||
| October 14, 1995 | May 17, 1997 | November 8, 2003 | 1–2 | 2 | 1 | ||
| October 14, 1995 | May 20, 2000 | September 20, 2003 | 1–5 | 5 | 1 | 112 | |
| October 14, 1995 | January 4, 1997 | May 16, 2009 | 1–2 | 2 | 5 | ||
| October 14, 1995 | May 16, 1998 | None | 1–3 | 3 | None | ||
| October 14, 1995 | May 19, 2001 | May 21, 2005 | 1–6 | 6 | 6 | 141 | |
| October 14, 1995 | May 17, 2003 | May 16, 2009 | 1–8 | 8 | 4 | 196 | |
| Cast Member | First Cast Appearance | Last Cast Appearance | Last Guest Appearance | Season | Total Seasons | Total Guest Appearances | Total Episodes |
| Tim Conlon (F) | September 20, 1997 | None | 2—3 | 2 | None | ||
| September 20, 1997 | May 18, 2002 | May 16, 2009 | 3—7 | 5 | 3 | 121 | |
| September 20, 1997 | May 21, 2005 | None | 3—10 | 8 | None | 198 | |
| September 20, 1997 | May 18, 2002 | May 16, 2009 | 3—7 | 5 | 4 | 122 | |
| September 20, 1997 | May 16, 1998 | None | 3 | 1 | None | ||
| September 20, 1997 | May 20, 2000 | None | 3—5 | 3 | None | ||
| September 20, 1997 | May 16, 1998 | None | 3 | 1 | None | ||
| September 12, 1998 | May 22, 1999 | None | 4 | 1 | None | ||
| September 12, 1998 | May 22, 2004 | May 16, 2009 | 4—9 | 6 | 3 | 150 | |
| September 12, 1998 | May 17, 2008 | March 21, 2009 | 4—13 | 10 | 1 | 239 | |
| November 27, 1999 | May 19, 2001 | None | 5—6 | 2 | None | ||
| Cast Member | First Cast Appearance | Last Cast Appearance | Last Guest Appearance | Season | Total Seasons | Total Guest Appearances | Total Episodes |
| Brooke Totman (F) | January 15, 2000 | April 15, 2000 | None | 5 | 1 | None | |
| October 7, 2000 | May 19, 2001 | None | 6 | 1 | None | ||
| Jeff Richards (F) | October 7, 2000 | November 4, 2000 | None | 6 | 1 | None | |
| Dannah Feinglass (F) | October 14, 2000 | January 27, 2001 | None | 6 | 1 | None | |
| November 4, 2000 | May 18, 2002 | None | 6—7 | 2 | None | ||
| November 18, 2000 | May 6, 2006 | None | 6—11 | 6 | None | 120 | |
| September 22, 2001 | May 20, 2006 | None | 7—11 | 5 | None | 117 | |
| Kathryn Fiore (F) | September 29, 2001 | May 11, 2002 | None | 7 | 1 | None | |
| October 6, 2001 | May 16, 2009 | None | 7—14 | 8 | None | 147 | |
| Taran Killam (F) | November 10, 2001 | May 11, 2002 | None | 7 | 1 | None | |
| April 27, 2002 | April 5, 2003 | None | 7—8 | 2 | None | ||
| September 14, 2002 | May 19, 2007 | None | 8—12 | 5 | None | 112 | |
| September 14, 2002 | May 22, 2004 | None | 8—9 | 2 | None | ||
| November 2, 2002 | May 21, 2005 | None | 8—10 | 3 | None | ||
| Simon Helberg (F) | November 16, 2002 | February 22, 2003 | None | 8 | 1 | None | |
| December 21, 2002 | May 21, 2005 | None | 8—10 | 3 | None | ||
| Christina Moore (F) | January 18, 2003 | May 10, 2003 | None | 8 | 1 | None | |
| September 13, 2003 | May 20, 2006 | September 28, 1996 | 9—11 | 3 | 1[1] | ||
| Gillian Vigman (F) | September 13, 2003 | May 15, 2004 | None | 9 | 1 | None | |
| November 1, 2003 | March 28, 2009 | None | 9—14 | 6 | None | 113 | |
| November 15, 2003 | May 17, 2008 | None | 9—13 | 5 | None | ||
| Melissa Paull (F) | December 20, 2003 | February 7, 2004 | None | 9 | 1 | None | |
| February 7, 2004 | May 16, 2009 | None | 9—14 | 6 | None | 106 | |
| Cast Member | First Cast Appearance | Last Cast Appearance | Last Guest Appearance | Season | Total Seasons | Total Guest Appearances | Total Episodes |
| February 5, 2005 | May 16, 2009 | None | 10—14 | 5 | None | 81 | |
| Spencer Kayden (F) | February 26, 2005 | May 21, 2005 | None | 10 | 1 | None | 4 |
| September 17, 2005 | May 16, 2009 | None | 11—14 | 4 | None | ||
| September 17, 2005 | May 19, 2007 | None | 11—12 | 2 | None | ||
| September 17, 2005 | May 19, 2007 | None | 11—12 | 2 | None | ||
| Lisa Donovan (F) | February 17, 2007 | May 5, 2007 | None | 12 | 1 | None | |
| November 3, 2007 | May 16, 2009 | None | 13—14 | 2 | None | ||
| Anjelah Johnson (F) | November 10, 2007 | February 16, 2008 | None | 13 | 1 | None | |
| Dan Oster (F) | November 24, 2007 | May 17, 2008 | None | 13 | 1 | None | |
| Daheli Hall (F) | February 2, 2008 | May 17, 2008 | None | 13 | 1 | None | |
| Erica Ash (F) | September 13, 2008 | April 25, 2009 | None | 14 | 1 | None | 12 |
| Matt Braunger (F) | September 13, 2008 | April 25, 2009 | None | 14 | 1 | None | 11 |
| Eric Price (F) | September 13, 2008 | April 25, 2009 | None | 14 | 1 | None | 12 |
| Lauren Pritchard (F) | September 13, 2008 | April 25, 2009 | None | 14 | 1 | None | 11 |