Washington County, Nebraska
Washington County is a county in the U.S. state of Nebraska. As of the 2020 census, the population was 20,865, and was estimated to be 21,302 in 2025. The county seat and the largest city is Blair.
Washington County is part of the Omaha–Council Bluffs metropolitan area.
In the Nebraska license plate system, Washington County was represented by the prefix "29" (as it had the 29th-largest number of vehicles registered in the state when the license plate system was established in 1922).