Blair is a city in and the county seat of Washington County, Nebraska, United States. The population was 7,990 at the 2000 census. Blair is a part of the Omaha-Council Bluffs Metropolitan Statistical Area.
Blair, county seat and largest city in Washington County, was not one of its earliest towns. It was established when the Sioux City and Pacific Rail Road chose to cross the river at that location, going from Missouri Valley, Iowa, and up along "Carter Hollow" on the Nebraska side. Whether by chance or design, the route missed the existing river towns of DeSoto and Cuming City. An entirely new town was needed.
A 1,075-acre (4.35 km2) tract of land was purchased and platted, with lots to be sold at auction on May 10, 1869. The entire tract was purchased by John I. Blair, an official of the railroad, who announced his plans for the city, which he named for himself.