The Walking Dead Survivor checklist (as of the Season 2 finale):
King County
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Rick Grimes - alive
The Jones Family (encountered by Rick after he wakes up):
Morgan Jones - last seen alive, episode 1.1
Duane Jones - last seen alive, episode 1.1
Atlanta Group
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Lori Grimes - alive
Carl Grimes - alive
Shane Walsh - dead
Glenn - alive
Dale Horvath - dead
Andrea - alive
Amy - dead
Jacqui - dead
Theodore "T-Dog" Douglas - alive
Jim - dead
Carol Peleiter - alive
Ed Peletier - dead
Sophia Peletier - dead
Daryl Dixon - alive
Merle Dixon - last seen alive, episode 1.3
The Morales Family (part of the Atlanta Group, but left to head for Alabama):
Morales - last seen alive, episode 1.5
Miranda - last seen alive, episode 1.5
Eliza - last seen alive, episode 1.5
Louis - last seen alive, episode 1.5
In Atlanta
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Dr. Edwin Jenner (last surviving staff of the Center for Disease Control) - dead
The Vatos Gang (caregivers of the senior residents at an Atlanta nursing home):
Guillermo - last seen alive, episode 1.4
Miguel - last seen alive, episode 1.4
Felipe - last seen alive, episode 1.4
Jorge - last seen alive, episode 1.4
Greene Farm
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Hershel Greene - alive
Maggie Greene - alive
Beth Greene - alive
Patricia - dead
Otis - dead
Jimmy - dead
Unknown Gang (encountered by Rick, Hershel and Glenn in one of the neighboring towns):
Dave - dead
Tony - dead
Sean - dead
Randall - dead
Nate - last seen alive, episode 2.9
Outskirts
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Michonne - alive