1. Discovery Cove - Orlando, FL 
Discovery Cove is an Orlando, Florida theme park where guests can interact with a variety of marine animals, most notably bottlenose dolphins. The park, which is operated by the Busch Entertainment Corporation (the theme park division of Anheuser-Busch) is adjacent to SeaWorld Orlando. In addition to swimming with dolphins, Discovery Cove guests can interact with exotic birds, tropical fishes, sharks, rays and land mammals.

2. SeaWorld -  California , Florida, Texas

SeaWorld is a chain of marine parks in the United States, with operations in Orlando, Florida, San Diego, California, and San Antonio. The parks feature killer whale, sea lion, and dolphin shows and zoological displays featuring various other marine animals. The parks' icon is Shamu, the killer whale.
 
3. Georgia Aquarium - Atlanta, GA
The Georgia Aquarium, located in Atlanta, Georgia and is billed as the "world's largest aquarium" with more than 8 million US gallons  of marine and fresh water. This aquarium has more than 100,000 animals of 500 different species. The aquarium's notable specimens include young whale sharks (Norton, Alice, and Trixie) and four beluga whales (Nico, Natasha, Marina, and Maris).  
 
4. Living Seas - Epcot, Orlando
Dive below the waves and discover a magical world of water-filled wonder in one of the largest man-made ocean environments. The whole family will delight in finding Nemo and all his friends among the fascinating fish and other denizens of the deep! Marlin, Dory, Pearl, Gil, Bruce the shark and, of course, Nemo can all be seen in breathtaking underwater environments and interactive stations that provide fun and learning for everyone.

5. National Aquarium - Baltimore, MD 

The aquarium has an annual attendance of 1.6 million to see its collection of 10,500 specimens of 560 different species. Particular attractions include the dolphin display, rooftop rainforest, and central ray pool, and multiple-story shark tanks.

6. Monterey Bay Aquarium - Monterey, CA             
Among the aquarium's numerous exhibits, two are of particular note. The centerpiece of the near shore wing is a 33-foot  high tank for viewing California coastal marine life. This tank was the first in the world to simulate tidal currents on a large scale, enabling the aquarium to keep live California Giant Kelp. The second exhibit of note is a one million gallon tank in the Outer Bay Wing which features the world's largest single paned window. 

7. John G Shedd Aquarium - Chicago, IL    

John G. Shedd Aquarium in Chicago in the United States was at one time the largest indoor aquarium in the world with 5 million gallons of water and 22,000 fish; it has since been eclipsed by the 8 million gallon  Georgia Aquarium in Atlanta. It contains 1500 species including fish, marine mammals, birds, snakes, amphibians, and insects. The Shedd's newest permanent exhibit is "Wild Reef". This exhibit attempts to recreate a Philippine coral reef and is based on the Apo Island Marine Reserve, complete with living coral, multiple species of fish and rays, and a collection of sharks. The main draw of this attraction is a 400,000 gallon  shark tank with twelve foot  high curved windows, allowing visitors a "divers-eye view".     
 

8. New England Aquarium - Boston, MA 
The New England Aquarium, located in Boston, Massachusetts is one of the most prominent and popular public aquariums in the United States. The principal feature of the Aquarium is the Giant Ocean Tank, a cylindrical 200,000 gallon   tank simulating a Caribbean coral reef. This tank houses sharks, turtles, and many smaller reef-living fish. Open at the top, the concrete tank is surrounded by a walkway that spirals down from the top level allowing visitors access to 52 different windows which offer views of the reef from every angle and level. At the bottom, the tank stands in a large, square 150,000 gallon penguin exhibit, hosting three different penguin species; African penguins, rockhopper penguins and little blue penguins
 

9. Tennessee Aquarium - Chattanooga, TN 

The Tennessee Aquarium in Chattanooga, Tennessee is the largest freshwater aquarium in the world. The original "River Journey" facility is organized around the theme of "the story of the river", following the path of a raindrop from high in the Appalachian Mountains to the Gulf of Mexico. Approximately 2/3 of the walk the facility's display follows this theme, with the rest given over to smaller aquatic exhibits hosting organisms from around the world.
 

10. Aquarium of the Pacific - Long Beach, CA

The aquarium features a collection of over 12,500 animals representing almost 1,000 different species. The facility focuses on the Pacific Ocean in three major permanent galleries, Southern California and Baja, Northern Pacific and Tropical Pacific.
 

11. The Texas State Aquarium - Corpus Christi, TX
The Texas State Aquarium consists of exhibits that display a variety of ecosystems found in the Gulf of Mexico and coastal Texas, from coral reefs with sharks and barracuda swimming about to jetty systems populated by crabs and flounders to East Texas swamps and their alligators. Specialty tanks are dedicated to some of the most curious forms of sea life, such as octopuses, turtles, and sea horses. In the touch pools, guest can touch a stingray or bamboo shark if that's what you really want to do. The latest addition to the aquarium is Dolphin Bay, a protected environment for Atlantic bottle-nosed dolphins that are unable to survive in the wild.
 

12. Ripley's Aquarium - Myrtle Beach, SC

Ripley's Aquarium is a $40 million, state-of-the-art, 87,000 square-foot aquarium experience, located at Broadway at the Beach in Myrtle Beach, SC. At the aquarium, Visitors are surrounded on all sides by menacing giant sharks as they travel through Dangerous Reef, a 750,000 gallon tank, on a 330-foot moving glidepath. Other spectacular features at Ripley's® Aquarium include Ray Bay, highlighting a variety of rays from multiple viewing levels and Friendship Flats, where guests touch Atlantic rays, Southern rays, Cow-Nose rays, Spotted Eagle rays and Bonnet-Head sharks. Rainbow Rock offers a stunning view of thousands of brilliantly colored Pacific fishes from Hawaii, Australia and the Indian Ocean through an acrylic window the size of two movie screens.