Farmington is a city in Washington County, Arkansas, United States. The population was 3,605 at the 2000 census. It is part of the Fayetteville–Springdale–Rogers, AR-MO Metropolitan Statistical Area. Farmington borders Fayetteville to the west and sections of Fayetteville along Highway 16 are north of the city. The city of Farmington and Fayetteville have been growing in recent years, and Farmington is arguably transitioning from small town into a suburb of its larger neighbor.