Mereni is a commune in Constanța County, Northern Dobruja, Romania.

The commune includes four villages: The former village of Lungeni (historical name: Uzunlar) was merged with the village of Mereni by the 1968 administrative reform.

At the 2011 census, Mereni had 1,920 Romanians (90.14%), 28 Roma (1.31%), 5 Turks (0.23%), 177 Tatars (8.31%).

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