Below is a searchable list of all zombie IDs for use with the z_spawn command in L4D2 on Steam. You can also find documenation for the z_spawn command, which includes working examples.
z_spawn [npc id]
This command will spawn the NPC with the specified ID. See command page for NPC IDs.
|NPC ID||The ID of the NPC you wish to spawn.|
Find below working examples of the z_spawn command.
This cheat spawns a normal zombie.
This command spawns a mob of zombies.
This console command spawns a witch.
|Zombie Name||Zombie ID|
|Horde of Zombies||horde|
|Mob of Zombies||mob|