High Quality Content by WIKIPEDIA articles! Fairlington is an unincorporated neighborhood in Arlington County, Virginia, United States, located adjacent to Shirlington in the southernmost part of the county on the boundary with the City of Alexandria. The main thoroughfares are Interstate 395 (Shirley Highway) which divides the neighborhood into North and South Fairlington, State Route 7 (King Street) and State Route 402 (Quaker Lane).