Lakeside is a census-designated place in the East County region of San Diego County, California. The population was 21,152 at the 2020 census, up from 20,648 as of the 2010 census. Lakeside was home to the Kumeyaay prior to European contact, who called Lindo Lake "Ha Ptur" or Ha Pchurr, meaning lake or "circular water".
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