St. Augustine Beach is a city in St. Johns County, Florida, United States.

[4] According to the United States Census Bureau, the city has a total area of 1.9 square miles (5.0 km2), all land.

As of the 2020 United States census, there were 6,803 people, 2,851 households, and 1,762 families residing in the city.

[8] As of the 2010 United States census, there were 6,176 people, 5,494 households, and 2,546 families residing in the city.

St. Augustine Beach is organized with a commission-manager form of government; voters elect a City Commission which consists of five members who serve four-year, staggered terms.

Though based in the city,[11] it also serves neighboring St. Augustine including the historic districts, and the rest of the county.

[21] St. Johns County Public Library maintains the Anastasia Island Beach Branch.