The district was established in 1975 in the reorganization of the districts in North Rhine-Westphalia by joining the old districts Arnsberg, Brilon and Meschede.
Coat of arms
The coat of arms is the same as the old district of Arnsberg. It shows the eagle as the symbol of the earls of Arnsberg. When their county lost independence in 1368 it fell to the bishops of Cologne, so the eagle also has the Cologne cross.