Lompnieu is a former commune in the Ain department in eastern France. On 1 January 2019, it was merged into the new commune Valromey-sur-Séran.^[2]

You can help expand this article with text translated from the corresponding article in French. (December 2008) Click [show] for important translation instructions. View a machine-translated version of the French article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:Lompnieu]]; see its history for attribution. You may also add the template {{Translated|fr|Lompnieu}} to the talk page. For more guidance, see Wikipedia:Translation.

Quick Facts Country, Region ...

Lompnieu
Part of Valromey-sur-Séran
Location of Lompnieu
Lompnieu Show map of France Lompnieu Show map of Auvergne-Rhône-Alpes
Coordinates: 45°57′42″N 5°39′39″E
Country	France
Region	Auvergne-Rhône-Alpes
Department	Ain
Arrondissement	Belley
Canton	Plateau d'Hauteville
Commune	Valromey-sur-Séran
Area 1	11.35 km2 (4.38 sq mi)
Population  (2021)[1]	134
• Density	12/km2 (31/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
Postal code	01260
Elevation	524–1,241 m (1,719–4,072 ft) (avg. 650 m or 2,130 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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It is located in La Val Romey, which means, "The Roman Valley." The Romans built several outposts in the valley.

Lompnieu is located near the base of the large valley, with forest mounting on one side, and a plain with larger mountains looming on the other side. On a clear day, the snow-covered Alps can be seen. Lompnieu is around 600 metres in elevation. The climate is rather hot in the summer, attaining into the 1990s, and fairly cold in winter, with several large snow falls.

• Communes of the Ain department