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is a city in Indian River County, Florida, United States. The population was 16,181 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 18,671 .
Sebastian is a principal city of the Sebastian–Vero Beach Metropolitan Statistical Area, which includes all of Indian River County.
Sebastian is located at the northern end of Indian River County, Florida at .
According to the United States Census Bureau, the city has a total area of 35.1 km² (13.6 mi²). 32.7 km² (12.6 mi²) of it is land and 2.4 km² (0.9 mi²) of it (6.86%) is water.