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 Your Ad Here Clay County Florida Clay County is a county located in the U.S. state of Florida. The U.S. Census Bureau 2005 estimate for the county is 171,095. Its county seat is Green Cove Springs. History Clay County was created in December 1858. Its name is in honor of Henry Clay, famous American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.  |