Travelers are voting Downtown Aquarium as the best aquarium in Harris County. There is 1 aquarium in Aransas Pass a city just 170 km from Harris County. The most popular of these is Texas State Aquarium in Aransas Pass. You can find 3 aquariums in Texas and 35 aquariums in the country of United States. Our members favorite in Texas is Downtown Aquarium and Dallas World Aquarium is the top pick in United States. Want more? Check out our map of aquariums in Harris County.