Lemon Grove is a city in San Diego County, California, United States. The population was 27,627 at the 2020 census, up from 25,320 at the 20…Lemon Grove is a city in San Diego County, California, United States. The population was 27,627 at the 2020 census, up from 25,320 at the 2010 census. The area that eventually became Lemon Grove was part of Mission San Diego de Alcalá, one of the Spanish missions in California. After Mexico became independent from Spain, the Californios ranched on various land grants. The area that now includes Lemon Grove was granted to Santiago Argüello, who received more than 59,000 acres.
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