 This district was split into several "Ämter"; Merzweiler belonged to the "Amt" of Grumbach.Later, after the First World War, the Treaty of Versailles stipulated, among other things, that 26 of the Sankt Wendel district's 94 municipalities had to be ceded to the British- and French-occupied Saar.The remaining 68 municipalities then bore the designation “Restkreis St. Wendel-Baumholder”, with the first syllable of "Restkreis" having the same meaning as in English, in the sense of “left over”.