St. Johns County is a county located in northeastern Florida. As of the 2010 census, the population was 190,039. The county seat is St. Augustine. Due to the inclusion of Ponte Vedra Beach, it is one of the highest-income counties in the United States. St. Johns County is part of the Greater Jacksonville Metropolitan area. It has experienced explosive growth in the last ten years as a flood of people working in Jacksonville built new homes across the county line. St. Johns County was created in 1821 when Florida was ceded to the United States. The Onis-Adams Treaty was negotiated with Spain... by Secretary of State John Quincy Adams. The treaty gave Florida to the US in exchange for withdrawing a $5 million claim against Spain. It was named for St. Johns. St. Johns County and Escambia County were Florida's original two counties, with the Suwannee River being the boundary between the two. According to the 2000 census, the county has a total area of 821.43 square miles , of which 609.01 square miles is land and 212.42 square miles is water, much of it in the Atlantic Ocean. St. Johns County's main economic base is tourism.
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| Founded: | July 21, 1821 |
| State: | Florida |
| Population: | 191,323 |
| Area: | 821 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | St. Johns County, Florida, Saint Johns County |