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Grand Longwy Agglomération (before September 2021: Communauté d'agglomération de Longwy) is the communauté d'agglomération, an intercommunal structure, centred on the town of Longwy. It is located in the Meurthe-et-Moselle department, in the Grand Est region, northeastern France. Created in 1960, its seat is in Longwy. Its area is 173.5 km2. Its population was 62,433 in 2019, of which 14,774 in Longwy proper.

Longwy station is a railway station serving the town Longwy, Meurthe-et-Moselle department, northeastern France. It is situated on the Longuyon–Mont-Saint-Martin railway. The station is served by regional trains towards Luxembourg, Charleville-Mézières and Nancy.

Herserange (French pronunciation: [ɛʁsəʁɑ̃ʒ]; German: Herseringen, Luxembourgish: Hiirkeréng/Hierkeréng) is a commune in the Meurthe-et-Moselle department in north-eastern France. It is part of the urban area of Longwy.

The canton of Herserange (French: Canton d'Herserange) is a former French canton located in the department of Meurthe-et-Moselle in the Lorraine region (now part of Grand Est). This canton was organized around Herserange in the arrondissement of Briey. It is now part of the canton of Longwy. The last general councillor from this canton was Laurent Righi (PCF), elected in 1996.

Réhon (French pronunciation: [ʁe.ɔ̃]) is a commune in the Meurthe-et-Moselle department in north-eastern France. It is the town where Jean-Marc Reiser (1941–1983) was born.

Longwy (French pronunciation: [lɔ̃wi]; older German: Langich, [ˈlaŋɪç]; Luxembourgish: Lonkech) is a commune in the French department of Meurthe-et-Moselle, Lorraine, administrative region of Grand Est, northeastern France. The inhabitants are known as Longoviciens. In 2008, the ville neuve ("New Town") was listed as a UNESCO World Heritage Site, as part of the "Fortifications of Vauban" group for its contributions to the development of military architecture and engineering.

The canton of Longwy is an administrative division of the Meurthe-et-Moselle department, northeastern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Longwy. It consists of the following communes:

The Château de Longwy is a ruined castle, incorporated into the town's fortifications, in the commune of Longwy in the Meurthe-et-Moselle département of France.

Haucourt-Moulaine (French pronunciation: [okuʁ mulɛn]) is a commune in the Meurthe-et-Moselle department in north-eastern France.

Longlaville (French pronunciation: [lɔ̃lavil]; German: Longsdorf; Luxembourgish: Longsduerf) is a commune in the Meurthe-et-Moselle department in north-eastern France.

Mont-Saint-Martin (French pronunciation: [mɔ̃ sɛ̃ maʁtɛ̃] ; German: Martinsberg; Luxembourgish: Mäertesbierg) is a commune in the Meurthe-et-Moselle department in north-eastern France. It is part of the urban area of Longwy.

The canton of Mont-Saint-Martin is an administrative division of the Meurthe-et-Moselle department, northeastern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Mont-Saint-Martin. It consists of the following communes: