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is the county seat of and the only city in Camas County, Idaho, United States. The population was 395 at the 2000 census, nearly half of the rural county's population.
Fairfield is located at (43.346000, -114.791159), and is at an elevation of 5066 feet (1544 m) above sea level.
According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.9 km²), all of it land.