The district was founded in 1865 under the auspices of Idaho Territory.
[1] Peak enrollment in the Boise School District was reached in 1997 at 27,070.
The oldest is in Lewiston, founded three years earlier by the Washington Territory government.
Within Ada County the district includes most of Boise, all of Hidden Springs, most of Garden City, and a small portion of Eagle.
[3] A portion of the district extends into Boise County.