Longeau-Percey () is a commune in the Haute-Marne department in north-eastern France. It was created in 1972 by the merger of two former communes: Percey-le-Pautel and Longeau, initially under the name Le Vallinot.Modifications aux circonscriptions administratives territoriales (fusion de communes), Journal officiel de la République française n° 0177, 30 July 1972, pp. 8183-8184.
See also Communes of the Haute-Marne department
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