| As of the census of 2000, there were 123,135 people, 49,614 households, and 34,084 families residing in the county. The population density was 78/km˛ (202/mi˛). The median income for a household in the county was $50,099, and the median income for a family was $59,153. According to recent reports, St. Johns County has sustained growth in the double digits over the last 4 years in part due to the climate, location & housing affordability. According to the U.S. Census Bureau, the county has a total area of 2,127 km˛ (821 mi˛). Adjacent Cities and Counties
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| Government links/Constitutional offices | Judicial branch |