The sub-prefectures of the department are Arrah, Kotobi, and Krégbé.

In 2011, districts were introduced as new first-level subdivisions of Ivory Coast.

At this time, Arrah Department became part of N'Zi Region in Lacs District.

In 2012, it was joined with two other departments to form the new Moronou Region.

This Lacs District location article is a stub.