Blair is a city in and the county seat of Washington County, Nebraska, United States. The population was 7,990 at the 2010 census.
Blair was platted in 1869 when the Sioux City and Pacific Railroad was extended to that point. It was named for railroad magnate John Insley Blair, who was credited with bringing the railroad to town. Blair was incorporated as a city in 1872. Within its first year, Blair was designated county seat.
In March 1869, a small child playing on a railroad turntable in town was injured on the turntable. The father sued the railway for damages, leading all the way up to the Supreme Court of the United States in the 1873 case Sioux City & Pacific Railroad Co. v. Stout.
In 1874, during the Panic of 1873, a grasshopper storm enveloped the region.