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Elmwood Park Zoo is a zoo located in Norristown, Pennsylvania.

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The Erie Zoo, is a zoological park in Erie, Pennsylvania. It is located on 15 acres (6.1 ha) of land in Glenwood Park, just off West 38th Street between Cherry Street and Glenwood Park Avenue. The zoo has more than 400 animals, while the botanical gardens and greenhouse have over 600 species of plants from around the world. The zoo, which operates from March to November, attracts more than 400,000 annual visitors.

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The Lehigh Valley Zoo is a 29-acre (11.7 ha) zoo located in Schnecksville, Pennsylvania, United States, inside the 1,100-acre (445 ha) Trexler Nature Preserve. The zoo is open year round.

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The National Aviary, located in Pittsburgh, Pennsylvania, is the only independent indoor nonprofit aviary in the United States. It is also the country's largest aviary, and the only one accorded honorary "National" status by the United States Congress.

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The Philadelphia Zoo, located in the Centennial District of Philadelphia, on the west bank of the Schuylkill River, was the first true zoo in the United States. It was chartered by the Commonwealth of Pennsylvania on March 21, 1859, but its opening was delayed by the Civil War until July 1, 1874. The zoo opened with 1,000 animals and an admission price of 25 cents. For a brief time, the zoo also housed animals brought over from safari on behalf of the Smithsonian Institution, which had not yet built the National Zoo.

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The Pittsburgh Zoo is one of only six major zoo and aquarium combinations in the United States. Located in Pittsburgh, Pennsylvania's Highland Park, the zoo sits on 77 acres (31 ha) of park land where it exhibits more than 4,000 animals representing 475 species, including 20 threatened or endangered species.

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ZooAmerica is a zoo located in Hershey, Pennsylvania, United States. The zoo was founded in 1910 by Milton S. Hershey with a few animals, including bears, birds, and deer. Today, the zoo covers 11 acres and is home to more than 75 species and 200 individual animals, including some that are rare and endangered.