![]() | Your Ad Here St. Lucie County, Florida St. Lucie County is a county located in the state of Florida. The U.S. Census Bureau 2005 estimate for the county is 241,305. Its county seat is Fort Pierce. History St. Lucie County was created in 1844. It was named for Saint Lucie of Syracuse, Roman Catholic saint, born in Sicily, executed in 304 for being a Christian. ![]() |