Brown County, Nebraska
Brown County is a county in the U.S. state of Nebraska. As of the 2020 census, the population was 2,903, and was estimated to be 2,826 in 2025. The county seat and the largest city is Ainsworth.
In the Nebraska license plate system, Brown County was represented by the prefix "75" (as it had the 75th-largest number of vehicles registered in the state when the license plate system was established in 1922).