<P> St. Johns County is a county of the U.S. state of Florida . As of the 2010 United States Census , the county 's population was 190,039 . The county seat and largest incorporated city is St. Augustine . St. Johns County is part of the Jacksonville metropolitan area . </P>
<P> St. Johns County is a county of the U.S. state of Florida . As of the 2010 United States Census , the county 's population was 190,039 . The county seat and largest incorporated city is St. Augustine . St. Johns County is part of the Jacksonville metropolitan area . </P>
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