Fairfield

Fairfield is a medium-sized city where the No Mercy campaign takes place. Interviews with the developers have revealed that this city is located in a fictional part of Philadelphia, and is also located in the 215 area code according to a store sign in No Mercy. Main features include Mercy Hospital, a large subway network and a factory complex. The city has been mostly overrun by The Infected with only a small number of safe rooms scattered across the city.

Maps found within the Farmhouse at the end of the Blood Harvest campaign indicate that the cities of Fairfield, Newburg, and Riverside are all located in western Pennsylvania, in the vicinity of Allegheny National Forest. The map itself indicates that all of the following locales were overrun during the infectious outbreak.

Fairfield may be where the outbreak started, as there seems to be a few pointers to the infection first being discovered in an isolation room in Mercy Hospital. This may mean that doctors were unsure of what the infection was at that time and tried to isolate the infected victim to stop it spreading, although this seemed to have failed.

Afterward
In Left 4 Dead 2, with the infection all over the United States, Fairfield's status may be unimaginably hellish, as the Infection may have consumed the city completely.

Landmarks in Fairfield

 * Mercy Hospital
 * Holly Street Station
 * "Pump & Run" Gas Station