 This ZIP code claimed a population of 36,917 at the 2010 census, for a land area of .Based on the 2013 TIGER/Line Shapefiles from the U.S. Census Bureau, which approximates ZIP codes with ZIP Code Tabulation Areas, the Saint Johns mailing address applies to the area of St. Johns County north of County Road 210 and west of U.S. Route 1.The north boundary of the community and county is mostly Julington Creek and Durbin Creek, which also form the south edge of Jacksonville, while the west boundary lies along the St. Johns River, across from Fleming Island and Green Cove Springs.