How many zoos are in the United States: a verified overview
There are approximately 2,800 to 3,000 entities marketed as zoos or animal parks in the United States, serving as hubs for conservation, education, and recreation. This range reflects varying definitions of what counts as a zoo, from large accredited institutions to smaller facilities and seasonal exhibits. Not all are independently operated; many are part of national or regional networks, and the total can change as facilities open, merge, or close. This overview breaks down how zoos are defined and counted, and what the numbers mean for animal welfare, conservation, and public access.
What counts as a zoo in the United States
A zoo is commonly defined as a permanent facility that houses animals not typically found in the local environment, holds them in enclosures, and provides structured public access. In practice, legal definitions vary by state, and definitions used by registries or accreditors may include or exclude different facility types, such as wildlife sanctuaries, animal parks, or roadside exhibitors. Key qualifiers include:
- Permanent, dedicated animal collections (not temporary seasonal shows)
- Public accessibility on a recurring schedule
- Some level of animal care, housing, and record-keeping
- Possible integration with conservation, research, or education programs
Because these criteria can be applied with varying strictness, aggregated counts can differ substantially depending on the source and scope.
Accreditation and how it shapes the count
Accreditation usually requires meeting higher standards for animal care, welfare, staffing, and conservation involvement. Facilities accredited by the Association of Zoos and Aquariums (AZA), for example, must undergo rigorous multi-year reviews, while USDA licensing applies more broadly but does not equate to accreditation. Because accreditation is voluntary, many facilities operate without it, which means they may be included in broad counts but not in lists limited to accredited members.
How zoos are counted and reported in the US
There is no single government source that produces one definitive number of all zoos in the United States. Counts may come from federal agencies, industry associations, or registries, each with its own method and definition. Common sources include:
- USDA Animal and Plant Health Inspection Service (APHIS) licenses, required for animals covered under the Animal Welfare Act
- AZA institutional membership lists, limited to accredited facilities
- Association of Zoological Wildlife and Aquarium Directors (AZWAD) and other regional or thematic registries
- Commercial directories, facility surveys, and academic databases
These sources can yield different totals, and each has strengths and limitations related to coverage, update frequency, and how strictly the term zoo is applied.
Illustrative comparison of zoo counts
| Source or metric | Verified detail or estimate | Context or why it matters |
|---|---|---|
| Total entities marketed as zoos or animal parks | Approximately 2,800 to 3,000 | Includes a wide range of facilities and definitions; subject to definition and timing |
| AZA-accredited zoos | Approximately 230 to 240 | Facilities meeting high standards for animal care, welfare, and conservation |
| USDA licensed exhibitors (Class C and beyond) | Over 2,600 | Legal requirement for certain animal species; does not indicate accreditation |
| Accredited wildlife sanctuaries and related facilities (non-zoo types) | Hundreds, outside typical zoo counts | May focus on rescue or refuge rather than public exhibit, and are often excluded from zoo counts |
Key structural details about the US zoo landscape
Understanding how zoos are organized helps explain why totals vary and what different types of facilities contribute to the overall ecosystem. Major metropolitan institutions often operate as large nonprofits with extensive conservation programs, while smaller regional facilities may be privately owned or operated as for‑profit businesses. Some locations are part of national chains or regional alliances, while others operate as independent community attractions. Typical structural characteristics include:
- Ownership models: municipal, nonprofit, private, or federal
- Scale differences: from single-building facilities to multi-acre campuses
- Accreditation status: AZA, regional, or none
- Primary missions: recreation, conservation, research, or a combination
Variations across states and regions
The distribution of zoos is not uniform across the United States. Factors such as climate, population density, tourism markets, and state-level regulations influence where facilities are located and how they operate. Some states host many large accredited institutions, while others have smaller facilities, roadside zoos, or seasonal exhibits. Regional differences affect animal diversity, visitor volume, and the range of educational or conservation programs available to local communities.
What the numbers mean for animal care and conservation
Accredited zoos contribute significantly to species survival programs, habitat protection, and public education, often with measurable outcomes in breeding, research, and reintroduction. Facilities that meet higher standards of care and transparency typically provide more structured welfare protocols, veterinary oversight, and enrichment programs. Understanding the landscape helps visitors and stakeholders distinguish between high‑quality, accredited institutions and facilities that may operate with more limited oversight.
How to evaluate a zoo’s credibility and contributions
When assessing a zoo, look for clear accreditation, transparent animal welfare practices, documented conservation initiatives, and accessible information about staff qualifications and veterinary care. Accredited institutions usually publish annual reports, participate in cooperative breeding programs, and engage with peer networks. For visitors and researchers, this information supports informed decisions and meaningful engagement with animal care and conservation topics.