Sebastian is a city in Indian River County, Florida, United States. In 2020, the population recorded by the U.S. Census Bureau was 25,054. Seb…Sebastian is a city in Indian River County, Florida, United States. In 2020, the population recorded by the U.S. Census Bureau was 25,054. Sebastian is a principal city of the Sebastian−Vero Beach–West Vero Corridor Metropolitan Statistical Area, which includes all of Indian River County.
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