Longchamp-sur-Aujon (French pronunciation: [lɔ̃ʃɑ̃ syʁ oʒɔ̃], literally Longchamp on Aujon) is a commune in the Aube department in north-central France.

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Longchamp-sur-Aujon
Commune
A general view of Longchamp-sur-Aujon
Location of Longchamp-sur-Aujon
Longchamp-sur-Aujon Show map of France Longchamp-sur-Aujon Show map of Grand Est
Coordinates: 48°09′03″N 4°49′55″E
Country	France
Region	Grand Est
Department	Aube
Arrondissement	Bar-sur-Aube
Canton	Bar-sur-Aube
Intercommunality	Région de Bar-sur-Aube
Government
• Mayor (2020–2026)	Patrick Mary[1]
Area 1	16.39 km2 (6.33 sq mi)
Population  (2021)[2]	367
• Density	22/km2 (58/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	10203 /10310
Elevation	192–334 m (630–1,096 ft) (avg. 192 m or 630 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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The Aujon forms part of the commune's eastern border, crosses the village, flows west through the middle of the commune, then flows into the Aube, which forms the commune's western border.

• Communes of the Aube department