A Georgia county school district lost its accreditation Thursday, an unusual move blamed in part on what has been called a “dysfunctional” school board.

Authorities say a Georgia county’s school district has become the third in the nation in 40 years to lose its accreditation.

Gallaudet University, the nation’s only liberal arts college for the deaf, has been taken off probation by its accrediting agency after a review of its enrollment...