Input (grade 13): The district in its present form was established on July 1, 1972 by merging the former districts of Melle, Bersenbrück and Wittlage, and most of the old district of Osnabrück.
Output (grade 9): The district was established in 1972 by merging four old districts (Osnabrück, Melle, Bersenbrück, Wittlage).