Tierra Verde is a census-designated place in Pinellas County, Florida, United States. The population was 3,721 at the 2010 census. The community is located on an island near the entrance of Tampa Bay, and is connected by the bridges of the Pinellas Bayway to both St. Petersburg and St. Pete Beach. At the southern end of Tierra Verde is Fort De S…Tierra Verde is a census-designated place in Pinellas County, Florida, United States. The population was 3,721 at the 2010 census. The community is located on an island near the entrance of Tampa Bay, and is connected by the bridges of the Pinellas Bayway to both St. Petersburg and St. Pete Beach. At the southern end of Tierra Verde is Fort De Soto, a county park.