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is a city in Nueces County, Texas, United States, on Mustang Island, across Aransas Bay from the City of Aransas Pass. The population was 3,370 at the 2000 census. Port Aransas claims to be one of the most popular vacation spots in Texas.
According to the United States Census Bureau, the city has a total area of 12.1 square miles (31.3 km²), of which, 8.8 square miles (22.8 km²) of it is land and 3.3 square miles (8.4 km²) of it (27.01%) is water.