Fairfield is a city in, and the county seat of, Jefferson County, Iowa, United States. It has a population of 9,416 people, according to the 2020 ce…Fairfield is a city in, and the county seat of, Jefferson County, Iowa, United States. It has a population of 9,416 people, according to the 2020 census. The median family income is $46,138, with 10% of families below the poverty line.
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