The 3 arrondissements of the Orne department are:[1]
- Arrondissement of Alençon, (prefecture of the Orne department: Alençon) with 111 communes.[2] The population of the arrondissement was 86,907 in 2016.
- Arrondissement of Argentan, (subprefecture: Argentan) with 123 communes. The population of the arrondissement was 110,239 in 2016.
- Arrondissement of Mortagne-au-Perche, (subprefecture: Mortagne-au-Perche) with 151 communes. The population of the arrondissement was 88,162 in 2016.