- J.J. Franzen
- technology supervisor / cio / systems administrator / email/internet/electronic information officer / ceo / CIO / electronic information officer (193 episodes, 1998-2023)
- Steve Neuvenheim
- assistant production accountant / production accountant (136 episodes, 1998-2015)
- Erick Thorpe
- licensing artist (125 episodes, 1998-2012)
- Johnny Sweeney
- technical director / key technical director (122 episodes, 2005-2023)
- Daniel Patao
- technical director / lead technical director (121 episodes, 2004-2023)
- Byron Lopez
- technical director / key technical director (119 episodes, 2005-2023)
- Peder Lester
- technical director / key technical director (118 episodes, 2005-2023)
- Wonnie Ro
- lead technical director / technical director / key technical director (115 episodes, 2004-2019)
- Kirstin Moser
- production accountant (115 episodes, 2005-2023)
- Ben Paine
- production coordinator / assistant to executive producer / post production coordinator (106 episodes, 2003-2019)
- Nicole Filiatrault
- technical director (105 episodes, 2005-2019)
- Christina Yeung
- technical director / key technical director (100 episodes, 2006-2023)
- Blake Metzler
- technical director / technical director: High Defenition Project / key technical director (95 episodes, 1999-2023)
- Tina Middleton
- office manager (95 episodes, 2008-2023)
- Bruna White
- technical director (90 episodes, 2007-2020)
- Alecia Shyngle
- production accountant (82 episodes, 1997-2005)
- Vernon Harveaux
- chief engineer (79 episodes, 2010-2023)
- Sean Laverty
- systems administrator / technology supervisor / pharmaceutical catering (74 episodes, 1997-2003)
- Will Meyer
- technical director / key technical director (74 episodes, 2010-2023)
- Vernon Chatman
- consultant (71 episodes, 2001-2007)
- Carly J. Price
- assistant to the executive producers / assistant to the executive producer (71 episodes, 2014-2023)
- Susan Hurwitz Arneson
- consultant (70 episodes, 2006-2012)
- Mark Dietel
- cto / lead pipeline developer / pipeline developer (70 episodes, 2013-2023)
- Kristian Boeker
- technical director / technical director: High Defenition Project (67 episodes, 2000-2023)
- Nanni Baldini
- Italian dubbing: Stan Marsh (66 episodes, 1997-2000)
- Angelo Nicotra
- Italian dubbing: Herbert Garrison (66 episodes, 1997-2000)
- Wonnie Jung
- technical director (65 episodes, 1997-2003)
- Brian Carter
- technical director / lead technical director (64 episodes, 2013-2023)
- Tory Hoke
- pipeline engineer / senior pipeline developer / cto (61 episodes, 2008-2016)
- John Kujawa
- technical director / key technical director (60 episodes, 2009-2023)
- Melanie Stimmell
- technical director (59 episodes, 1999-2005)
- Nicolas McConnell Navarro
- adr mixing: post production / voice dubbing: post production (58 episodes, 2013-2018)
- Pam Brady
- consultant / creative consultant (57 episodes, 1997-2023)
- Joseph Gerges
- technical director (57 episodes, 1998-2004)
- Jenny Shin
- technical director / lead technical director / assistant: Phillip (56 episodes, 1998-2002)
- Gil Nevo
- technical director / key technical director (56 episodes, 2000-2007)
- Jenny Yu
- lead technical director / supervising technical director (56 episodes, 2002-2009)
- Marc A. Flores
- production coordinator / production assistant / assistant production coordinator (56 episodes, 2014-2023)
- Jeff Delgado
- technical director (54 episodes, 2005-2012)
- David Madison Brown
- production assistant / assistant production coordinator / key production assistant (53 episodes, 2008-2015)
- Charles Song
- assistant to executive producer / production assistant / assistant to the executive producers / assistant: executive producer (51 episodes, 1999-2002)
- David Lenna
- development lead / cto / r&d engineer (51 episodes, 2008-2015)
- Melissa Morvant
- office coordinator / production assistant / kroff services (49 episodes, 1997-2000)
- Omar Smith
- technical director / technical research and development (49 episodes, 1998-2002)
- Jonathan Kimmel
- consultant (48 episodes, 2005-2023)
- Maria Elena Heredia
- spanish dubbing (47 episodes, 2002-2005)
- Jeffrey Gulan
- technical director (47 episodes, 2005-2010)
- James Valladao
- supervising technical director / technical director (46 episodes, 1997-2000)
- Chris Romano
- production assistant / writers assistant / assistant to writer / assistant to writers (46 episodes, 2001-2003)
- Fabrizio Manfredi
- Italian dubbing: Kyle Broflovski (45 episodes, 1998-2000)
- Jon Singer
- lead technical director / technical director / key technical director / monkey handler (44 episodes, 1997-2000)
- Valeska Difrieri
- assistant production accountant (44 episodes, 2016-2023)
- Mark Munley
- production coordinator / a prince / production assistant (43 episodes, 1998-2010)
- Kyle McCulloch
- consultant (43 episodes, 2003-2005)
- Amir Bahadori
- technical director (42 episodes, 1999-2003)
- Paul Hargrave
- technical director (42 episodes, 2005-2010)
- Richard Duncan Sr.
- system administrator / senior system administrator / Senior System Administrator (42 episodes, 2016-2023)
- John Rhoads
- pipeline engineer (42 episodes, 2016-2023)
- Toni Wurts
- technical supervisor (41 episodes, 2000-2005)
- Elaine Kim
- technical director (35 episodes, 1998-2000)
- Javier Bello
- technical director (35 episodes, 2000-2004)
- Chris Fria
- technical director / technical research and development (34 episodes, 1998-2001)
- Gary Martinez
- assistant: executive producer / production assistant / assistant production coordinator (34 episodes, 2008-2011)
- Jack Zegarski
- assistant: executive producer / assistant: executive producers / assistant to executive producer (34 episodes, 2008-2010)
- Steven Kunes
- executive story editor (33 episodes, 2012-2014)
- Erica Rivinoja
- consultant (31 episodes, 2003-2005)
- Keith Nesson
- email/internet/electronic information officer (31 episodes, 2004-2008)
- Peter Merryman
- technical director / moose (30 episodes, 1997-2005)
- Fabio Chadad
- translation to portuguese (30 episodes, 2004-2023)
- Steve Rippin
- key production assistant / production assistant / assistant production coordinator (30 episodes, 2008-2010)
- Spencer Howland
- production assistant / assistant production office coordinator (30 episodes, 2017-2019)
- Elyse Ramsdell
- production coordinator (29 episodes, 2009-2011)
- Karin Perrotta
- production coordinator / production assistant / kroff services / post production supervisor (27 episodes, 1998-2002)
- John Kujawa
- technical director / key technical director (27 episodes, 2017-2022)
- Luis F. Sanchez
- technical director: High Defenition Project (26 episodes, 1999-2001)
- Lucas Walker
- technical director: High Defenition Project (26 episodes, 1999-2001)
- Breayle Riess
- web master (26 episodes, 2001-2004)
- Kurt Nickels
- assistant to executive producer (26 episodes, 2004-2007)
- Daniel Lindsey
- technical director (25 episodes, 2001-2004)
- Jessica Coate
- technical director (24 episodes, 2002-2005)
- Nate Pellettieri
- assistant production coordinator / production assistant (24 episodes, 2004-2008)
- Dave Horowitz
- technical director (24 episodes, 2019-2023)
- Matt Prager
- consultant (23 episodes, 2001-2002)
- Adrien Beard
- production artist supervisor / fart wrangler (22 episodes, 1998-2006)
- John Spence
- pipeline developer (22 episodes, 2017-2020)
- Melissa Hawkins
- technical director (21 episodes, 2006-2007)
- Bill Hader
- consultant / creative consultant (20 episodes, 2008-2017)
- Mara Waldman
- network executive: Comedy Central (21 episodes, 2018-2020)
- Angela De La Garza
- production assistant / assistant production accountant (20 episodes, 2000-2001)
- R. Emmett Sibley
- production assistant (20 episodes, 2005-2008)
- Adam Arkin
- production assistant (20 episodes, 2017-2018)
- Nick DiLorenzo
- assistant (20 episodes, 2018-2019)
- Nick Logsdon
- production assistant (20 episodes, 2018-2019)
- Daniel Lyons
- production assistant (20 episodes, 2018-2019)
- Kevin Jakubowski
- production assistant (19 episodes, 2004-2006)
- John M. Watson
- chief engineer / moyel (17 episodes, 1998-2009)
- Jefferson O.S. Brassfield
- production assistant / office coordinator (16 episodes, 2000)
- Newton Cox
- production assistant (17 episodes, 2001-2003)
- Josh Fogel
- production office coordinator (17 episodes, 2001-2003)
- Christian Vigeland
- production assistant (17 episodes, 2001-2003)
- Michael Lloyd
- production assistant (17 episodes, 2010-2011)
- Sam Young
- production assistant (17 episodes, 2010-2011)
- Erin Kurtz
- production assistant (16 episodes, 2005-2006)
- Kenny Lane
- production assistant (16 episodes, 2008-2009)
- Jennifer Sieck
- technical director (15 episodes, 1998-2000)
- Jonathan Abraham
- production assistant / assistant to executive producer (15 episodes, 2002-2004)
- Kevin Carlson
- production assistant (15 episodes, 2014-2015)
- Amanda L. Garefino
- production assistant / key production assistant (15 episodes, 2014-2015)
- Lori Gilmour
- technical director (14 episodes, 1998-2000)
- Tim Calpin
- production assistant / assistant to executive producer (14 episodes, 2004-2006)
- Dave Tennant
- consultant (14 episodes, 2006)
- Brad Neely
- consultant (14 episodes, 2007-2009)
- Mike McMahan
- production assistant (14 episodes, 2007-2008)
- Nathan Chaffetz
- production assistant (14 episodes, 2009)
- Lilly Silbert
- assistant payroll accountant (14 episodes, 2014-2015)
- Melinda Carson
- assistant to executive producer (13 episodes, 1998-1999)
- Benjamin Gilberg
- assistant to executive producer (13 episodes, 1999-2000)
- Shawna Soper
- production assistant (13 episodes, 1999-2000)
- Holly Wenger
- technical director (13 episodes, 2003-2005)
- Ryan Quincy
- technical supervisor (13 episodes, 2006-2007)
- Kristen Schaal
- consultant (13 episodes, 2007)
- John 'Nancy' Hansen
- production coordinator / post production coordinator / post production supervisor (12 episodes, 1999-2006)
- Andrea Villasor
- production assistant (12 episodes, 1999)
- Eric Bucchare
- production assistant (12 episodes, 2000)
- Garnet Stevens
- production assistant (12 episodes, 2000)
- Paula Holmberg
- office manager (12 episodes, 2003-2005)
- Peter Serafinowicz
- creative consultant / consultant (12 episodes, 2014-2018)
- Jenna Ajlouny
- production assistant (12 episodes, 2019-2021)
- Amir Madani
- software engineer (12 episodes, 2022-2023)
- Tal Shenholz
- technical director (12 episodes, 2022-2023)
- Mun Pook Lui
- technical director (11 episodes, 2002-2004)
- Sam Woolley
- production assistant (11 episodes, 2003-2005)
- Julianne O'Hara
- production assistant / assistant production coordinator (11 episodes, 2016-2017)
- Josh Gad
- consultant (11 episodes, 2017-2019)
- Benjamin Travis
- it consultant (11 episodes, 2020-2023)
- Dariush Derakhshani
- technical director / supervising technical director / insemination consultant (10 episodes, 1997-1998)
- Ana Wolovick
- technical director (10 episodes, 1997-1998)
- Tom Stamatio
- production assistant (10 episodes, 1999)
- Alison Cowan
- production assistant (10 episodes, 2001-2002)
- Kenny Hotz
- consultant (10 episodes, 2005-2006)
- Michael Anthony Snowden
- consultant (10 episodes, 2006)
- Steff Landau
- Engagement Manager G/S/A (10 episodes, 2015)
- Jameel Saleem
- consultant (10 episodes, 2016-2017)
- Dodge Williams
- production assistant (10 episodes, 2016)
- Alex Wong
- technical director (10 episodes, 2016)
- A.J. Holmes
- consultant (10 episodes, 2017)
- Allie Bevacqua
- production assistant (10 episodes, 2022-2023)
- Michael Gibson
- assistant producer office coordinator / assistant production office coordinator (10 episodes, 2022-2023)
- Andrew Kemler
- production coordinator / production assistant / post-production coordinator / stand-in: Mr. Hussein (9 episodes, 1997-2003)
- Craig Cooney
- technical director (9 episodes, 2000)
- Michael O'Connor
- assistant to executive producer (9 episodes, 2006-2008)
- Alan Yang
- consultant (9 episodes, 2006)
- Michael Morena
- systems administrator (9 episodes, 2008-2009)
- David List
- production coordinator / fart coordinator (8 episodes, 1998-1999)
- Anthony Sant'Anselmo
- loop group: additional dialogue (8 episodes, 2017)
- Josh Lobis
- consultant (7 episodes, 2002)
- Darin Moiselle
- consultant (7 episodes, 2002)
- Dani Michaeli
- consultant (7 episodes, 2004)
- Jane Bussmann
- consultant (7 episodes, 2006)
- Kevin Biegel
- consultant (7 episodes, 2008)
- Joshua Delaney
- technical director (7 episodes, 2009)
- Michael Ponterotto
- production assistant (7 episodes, 2012-2013)
- Ben Rosen
- production assistant (7 episodes, 2012-2013)
- Skylar T. Stone
- production assistant (7 episodes, 2012-2013)
- B. Ian Hayden
- technical director (6 episodes, 1997)
- Andrew Orloff
- technical director (6 episodes, 1997)
- Margie Stubbs
- technical director (6 episodes, 1998-1999)
- Shayne Anderson
- production assistant (6 episodes, 1999)
- Max Hof
- assistant to executive producer / assistant: executive producer (6 episodes, 2000)
- Ellen Dunn
- production coordinator (6 episodes, 2005)
- Toby Morton
- consultant (6 episodes, 2005)
- Katie Mowatt
- production assistant (6 episodes, 2005)
- Thomas M. Vogt
- technical director (6 episodes, 2005)
- Sunshine Hurtienne
- production assistant (6 episodes, 2022)
- Darren Held
- production assistant (5 episodes, 1997)
- David Niles White
- technical consultant (5 episodes, 1997)
- Andrea V. Neuvenheim
- production assistant (5 episodes, 1999-2000)
- Brian Master
- editor: High Defenition Project (5 episodes, 1999)
- Jim Nasi
- production assistant (5 episodes, 1999)
- Amanda Crockett
- production assistant (5 episodes, 2000)
- John Shertz
- production assistant (5 episodes, 2000)
- Tricia Wilk
- production secretary (5 episodes, 2001)
- Shish Aikat
- technical director (5 episodes, 2002)
- Theresa Mulligan
- consultant (5 episodes, 2004)
- Joey Toth
- production assistant (5 episodes, 2004)
- Patrick Scouler
- production assistant (5 episodes, 2006)
- David Badgerow
- technical director (5 episodes, 2008)
- Peter Atherton
- production assistant (4 episodes, 1998)
- Kelly Cross
- production assistant (4 episodes, 1998)
- Christine A. Mueller
- production coordinator (4 episodes, 1998)
- Vincent DeLay
- technical director (4 episodes, 2006)
- Robert Popper
- creative consultant (4 episodes, 2010)
- Justin Israel
- senior pipeline developer (4 episodes, 2011-2012)
- Jay Sloat
- system support (4 episodes, 2011-2012)
- Karin Fong
- title designer (4 episodes, 2013)
- Wyatt Cenac
- consultant (4 episodes, 2016)
- Sam Stenson
- production assistant (4 episodes, 2022)
- Henry Bacon
- production assistant (4 episodes, 2023)
- Maxwell Keener
- production assistant (4 episodes, 2023)
- Kat Spencer
- assistant to the executive producer / assistant to the executive producers (4 episodes, 2023)
- Philip Stark
- production assistant (3 episodes, 1997)
- John Baurley
- technical director (3 episodes, 1998)
- Rob Howard
- technical director (3 episodes, 1999)
- Pam Kipp
- technical director (3 episodes, 2001)
- Mark O'Keefe
- consultant (3 episodes, 2001)
- Valentin Sinlao
- technical director (3 episodes, 2001)
- Carra Graziadio
- production assistant (3 episodes, 2003)
- Bill Wohlken
- assistant to executive producer / assistant to the executive producers (3 episodes, 2003)
- David Krause
- director of technology (3 episodes, 2008)
- Kenji Miwa
- production assistant (3 episodes, 2008)
- Gwynne Adik
- cut 'n' paster (2 episodes, 1997)
- Dian Bachar
- production assistant (2 episodes, 1997)
- Lisa Bachar
- cut 'n' paster (2 episodes, 1997)
- Herman Cheng
- technical director (2 episodes, 1997)
- Kathleen Innacone
- cut 'n' paster (2 episodes, 1997)
- Jason McHugh
- production coordinator (2 episodes, 1997)
- Amy Nation
- production assistant (2 episodes, 1997)
- Chris O'Brien
- cut 'n' paster (2 episodes, 1997)
- Randy Pijoan
- cut 'n' paster (2 episodes, 1997)
- Jason Stoval
- production assistant (2 episodes, 1997)
- Olga Volozova
- cut 'n' paster (2 episodes, 1997)
- Jennifer Walsh
- cut 'n' paster (2 episodes, 1997)
- Heather Ganziano
- production assistant (2 episodes, 1998)
- Chance Miller
- production assistant (2 episodes, 2002)
- Norman Lear
- consultant (2 episodes, 2003)
- Jeff Urquhart
- production assistant (2 episodes, 2007)
- Brian Keith Etheridge
- consultant (2 episodes, 2008)
- Craig LaMarsh
- production assistant / translator: German (2 episodes, 2011)
- Rich Brownstein
- computer consultant (1 episode, 1997)
- Debra Drimmer
- executive in charge of talent (1 episode, 1997)
- Jennifer M. Allen
- dialect coach (1 episode, 1998)
- Chris 'Crispy' Brion
- personal trainer: Mr. Hussein (1 episode, 1998)
- Martin Cendreda
- voice coach: Ms. Dion (1 episode, 1998)
- Annie Combs
- dialect coach (1 episode, 1998)
- David R. Goodman
- fart coach (1 episode, 1998)
- Bruce Howell
- trainer: Barky and Purry (1 episode, 1998)
- Jennifer Howell
- executive assistant: John Cusack (1 episode, 1998)
- Steve Kindernay
- dialect coach (1 episode, 1998)
- Dave Koch
- dialect coach (1 episode, 1998)
- Vicky Kwan
- technical director (1 episode, 1998)
- Sabrina Mar
- dialect coach (1 episode, 1998)
- Monica Mitchell
- welfare teacher (1 episode, 1998)
- Scott Oberholtzer
- body double: Ugly Bob (1 episode, 1998)
- Ivy Panlilo
- dialect coach (1 episode, 1998)
- Lydia Quidilla
- bead puller (1 episode, 1998)
- James Sant'Anselmo
- dialect coach (1 episode, 1998)
- Katie W. Scott
- body double: Ms. Celine Dion (1 episode, 1998)
- Paul Shomer
- assistant: Terrance (1 episode, 1998)
- Jackie Watson
- assistant: Ugly Bob (1 episode, 1998)
- Holly Wegner
- dialect coach (1 episode, 1998)
- Amy Winfrey
- moose wrangler (1 episode, 1998)
- Kweli Baker
- intern (1 episode, 2001)
- Charlie Hornsby
- production assistant (1 episode, 2001)
- Michael Roitman
- production assistant (1 episode, 2001)
- Daley Haggar
- consultant (1 episode, 2002)
- Greg Longstreet
- consultant (1 episode, 2002)
- David Gielicz
- production assistant (1 episode, 2003)
- Joey Calanni
- production assistant (1 episode, 2004)
- Donna Camargo
- technical director (1 episode, 2005)
- Sanjay Shah
- consultant (1 episode, 2009)
- Jim Cunningham
- production assistant (1 episode, 2011)
- Davide Albano
- Italian dubbing (1 episode, 2013)
- Roberto Mare
- Italian dubbing (1 episode, 2013)
- Frank Matano
- Italian dubbing (1 episode, 2013)
- Renato Novara
- Italian dubbing (1 episode, 2013)
- Walter Rivetti
- Italian dubbing (1 episode, 2013)
- Lucia Valenti
- Italian dubbing (1 episode, 2013)
- Francesca Vettori
- Italian dubbing (1 episode, 2013)
- James Saleem
- consultant (1 episode, 2016)
- Asmeret Ghebremichael
- consultant (1 episode, 2020)
- Michael Gibson
- production assistant (1 episode, 2020)
- Trey Parker
- assistant: Matt Stone (1 episode, 2023)
- George P. Burdell
- production assistant (uncredited) (7 episodes, 2008-2009)
- Jim Cunningham
- production assistant (uncredited) (4 episodes, 2011)
- Annushka Almendros
- production assistant (uncredited) (4 episodes, 2017)
- Guin Dill
- animal trainer (uncredited) (2 episodes, 2008)
- Maddie Taylor
- ADR voice group (uncredited) (1 episode, 2006)
- Sasha Schotzko-Harris
- stand-in (uncredited) (1 episode, 2015)
