Lake Grove is a village in Suffolk County, New York, United States. The population was 11,163 at the 2010 census. The village is located in the town of Brookhaven. The village is officially known as the Incorporated Village of Lake Grove.Lake Grove is a popular commercial area in Suffolk County, including stores and attractions such as the Smith Haven Mall, Trader Joe's, Whole Foods, and other large chain stores including DSW. Additional stores and attractions are located nearby in Nesconset, Stony Brook and South Setauket.The village features a number of different styles and prices of housing, including many well-maintained developments such as Crestwood Forest, Lake Grove Estates, Country Pointe, The Pines, Brittany Hills, and Country Woods. The village also has a number of parks, recreational facilities, and a nature preserve for residents to enjoy.Some areas within the Lake Grove zip code, such as the Hathaway Oaks development and parts of the Brittany Hills development, are actually located in the unincorporated hamlet of Lake Ronkonkoma within the towns of Brookhaven and Smithtown.