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is a census-designated place (CDP) in Willacy County, Texas, United States. The population was 415 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 5.7 square miles (14.8 km²), of which, 5.2 square miles (13.5 km²) of it is land and 0.5 square miles (1.3 km²) of it (8.76%) is water. A navigational channel connects Port Mansfield to the Laguna Madre, to the Intercoastal Waterway (canal), and cutting through South Padre Island, to the Gulf of Mexico. The cut through South Padre Island has shoaled considerably and as of early 2008 only shallow draft boats can safely enter at the Mansfield cut.{The channel was recently dredged by the Corps of Engineers. Federal money was secured from relief money following Hurricane Dolly and Ike. The channel is now 16-20 deep with all the dredge tailings making a spectacular beach on the north side of the jetty.}