[4] In the Nebraska license plate system, Brown County is represented by the prefix 75 (it had the 75th-largest number of vehicles registered in the county when the license plate system was established in 1922).

[5] Brown County is located in Nebraska's Outback region.

[6] As of the 2000 United States Census,[13] there were 3,525 people, 1,530 households, and 996 families in the county.

31.60% of all households were made up of individuals, and 16.90% had someone living alone who was 65 years of age or older.

As of 2024, only once has the county voted for the Democratic Party candidate in a national election since 1916.