Arrondissements of the Marne department
The 4 arrondissements of the Marne department are: Arrondissement of Châlons-en-Champagne, (prefecture of the Marne department: Châlons-en-Champagne) with 150 communes. The population of the arrondissement was 107,923 in 2021.
Source: Wikipedia — Arrondissements of the Marne department (CC BY-SA 4.0)