Arrondissement of Brussels
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The arrondissement was split in 1963 upon the fixation of the language border into the arrondissement of Brussels-Capital, the arrondissement of Halle-Vilvoorde and the short-lived arrondissement of Brussels-Periphery that would later be merged into Halle-Vilvoorde. The arrondissement of Brussels was retained as electoral district, under the new name Brussels-Halle-Vilvoorde, which would later become a contentious issue in Belgian politics until being split in 2012-2014.
The arrondissement still exists as a judicial arrondissement, though its prosecution service was split as well in 2014.