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. Some areas in Fairfield, most noticeably the Red Line North subway route, have caved in, or been destroyed. The city has been mostly overrun by the Infected with only a small number of safe rooms scattered across the city.

Fairfield also appears to be surrounded by a mountain range.

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. This is contradicted by the fact that Fairfield is on the lower eastern side of the state, in Philadelphia.

Due to small hints in an isolation room in Mercy Hospital, it has been surmised that the Infection may have started in Fairfield. 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 if this is the case, the doctors failed horribly.

Afterward
In Left 4 Dead 2, with reports of the Infection coming in from all parts of the United States, the possible origin of the epidemic, Fairfield, has possibly become unimaginably hellish.

Landmarks in Fairfield

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