In 1918 (confirmed by the Treaty of Trianon 1920), most of the county became part of newly formed Czechoslovakia, except 7,5% of its area (around Putnok), which became temporarily part of the Hungarian county Borsod-Gömör-Kishont (presently part of Borsod-Abaúj-Zemplén).
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Today in Hungary the name of Gömör/Gemer preserved only in the name of a small village, Gömörszőlős and in that of Gömöri station, the smaller railway station of Miskolc.