Saint-Dizier is a subprefecture Of the Haute-Marne department in north-eastern France.It has a population of 23,382 and is a subprefecture of the department. Although Saint-Dizier is marginally the most populous commune in Haute-Marne, the préfecture resides in the somewhat smaller commune of Chaumont.
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Coordinates 48°38'13.605" N 4°56'50.465" E