St. Johns County, Florida

St. Johns County
County
St. Johns County Courthouse
Flag Seal
Location within the U.S. state of Florida
Florida's location within the U.S.
Coordinates: 29°55′N 81°25′W / 29.91°N 81.41°W / 29.91; -81.41
Country	United States
State	Florida
Founded	July 21, 1821
Named for	San Juan del Puerto
Seat	St. Augustine
Largest community	St. Johns
Area
• Total	822 sq mi (2,130 km2)
• Land	601 sq mi (1,560 km2)
• Water	221 sq mi (570 km2)  26.9%
Population  (2020)
• Total	273,425
• Density	455/sq mi (176/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional districts	5th, 6th
Website	www.sjcfl.us

St. Johns County is a county in the northeastern part of the U.S. state of Florida. As of the 2020 United States census, its population was 273,425.^[1] The county seat and most populous incorporated city is St. Augustine, although the nearby community, St. Johns, has a higher population.^[2] St. Johns County is part of the Jacksonville, Florida Metropolitan Statistical Area.

The county was established in 1821. It is one of the two original counties established after Florida was ceded to the United States, at the start of the Florida Territorial period, and corresponded roughly to the former colonial province of East Florida. It was named for the St. Johns River, which runs along its western border.

St. Johns County primarily comprises residential bedroom communities for those who commute to Jacksonville. Tourism, primarily associated with St. Augustine and the many golf courses in the area, is the chief economic industry.