Hont County
In the aftermath of World War I, the part of Nógrád county north of the river Ipeľ/Ipoly became part of newly formed Czechoslovakia (as Novohrad county), as recognized by the concerned states in 1920 by the Treaty of Trianon. The southern part stayed in Hungary and was merged with the Hungarian part of Hont county to form Nógrád-Hont County in 1923. Following the provisions of the First Vienna Award, the northern half of the county was redeemed thus and the county had was recreated in 1938. After World War II, the Trianon borders and Nógrád-Hont County were restored. In 1950 the county was again recreated after some of its parts were passed to the newly formed Pest County and the reorganized Heves County.