County

County generally refers to one of the following:

Locations

 * Whitney County ― The main location and setting for the Crash Course campaign in Left 4 Dead.
 * Griffin County ―The main location and setting for the Dark Carnival campaign in Left 4 Dead 2.
 * Fort Harris County ―The city and setting for both custom campaigns, Suicide Blitz and Suicide Blitz 2.
 * Newburg ― The Survivors pass by the Tri-County Communications building/power station on their way to Metro International Airport in the Dead Air campaign.

Gameplay

 * Crash Course ― The campaign set in a county.
 * Dark Carnival ― The campaign takes place at an amusement park which is inside a county.
 * Suicide Blitz ― The custom campaign takes place in a city/county.
 * Suicide Blitz 2 ― The sequel to Suicide Blitz which also takes place in the same city/county.