 About 5.10% of families and 8.00% of the population were below the poverty line, including 9.30% of those under age 18 and 6.20% of those age 65 or over.The St. Johns County Board of County Commissioners is an elected five-member commission, which appoints a county administrator.The main environmental and agricultural body is the St. Johns County Soil and Water Conservation District, which works closely with other area agencies.