Texas · Nonprofit
Houston Zoo Inc
Houston Zoo Inc (Texas) receives grants from 171 organizations whose IRS filings report $46,615,727 to it, the largest being DAN L DUNCAN FOUNDATION ($7,458,070). 109 of them have funded it in more than one year.
- Revenue FY2024
- $83M
- Funders on record
- 171
- Grants received
- $47M
- Net assets
- $332M
What Houston Zoo Inc does
Mission
Mission: Connect communities with animals, inspiring action to save wildlife. Vision: Be a leader in the global movement to save wildlife. (Continued on Schedule O) Houston Zoo, Inc. (HZI) strives to be a zoo that practices exemplary animal care, delivers an outstanding guest experience, creates a workplace that instills respect and teamwork, provides learning opportunities, promotes conservation awareness, and inspires community support.
As stated on its FY2024 Form 990.
Programs
Houston Zoo, Inc. (HZI), accredited by the Association of Zoos and Aquariums (AZA), upholds the gold standard in animal care, safety, conservation, and education, earning a rare 100% clean AZA evaluation in 2024, a distinction achieved by only eight institutions in AZA history. In 2024, HZI welcomed over 2,000,000 guests, reflecting its "Zoo for All" commitment to accessibility. Attendance was distributed as follows: - 32% Members - 30% General Admission - 29% Free or Discounted Admission (including Free Entry, Lone Star cardholders, Military families, and Seniors) - 9% Zoo Lights (Continued on Schedule O)This "Zoo for All" access ensures families from diverse economic backgrounds experience the Zoo's animals, gardens, amenities and wildlife saving programming. In 2024, HZI opened Birds of the World on August 30, a major Centennial Master Plan project. This immersive exhibit showcases avian biodiversity across African Savanna, North American Woodlands, and South American Wetlands aviaries, connecting visitors to global conservation efforts and modernizing infrastructure on the Zoo's 55-acre campus. Volunteer engagement was a highlight again in 2024, with 479 adult volunteers…
$54,992,357 spent$51,485,469 earned by the program91% of program spendingWildlife conservation is a core HZI mission. In 2024, the Zoo supported 33 long-term partnerships across 17 countries, linking on-site animal care with global field conservation. Regional efforts focused on Texas species of concern, including: - Houston Toad Conservation: Release of 1,865,700 eggs, 4,300 tadpoles, and 430 toadlets in Bastrop County in partnership with USFWS and Texas State University. - Attwater's Prairie Chicken Conservation: Breeding and release of 58 birds into native grasslands. - Sea Turtle Conservation: Provided medical care for over 50 injured or stranded wild sea turtles along the Texas coast. (Continued on Schedule O)International wildlife conservation programs emphasized species in the Zoo's collection, exemplified by Birds of the World, which connects guests to partners protecting endangered avian species globally. Other efforts included protecting jaguars, giant anteaters, and tapirs in Brazil's Pantanal and reducing marine wildlife threats from plastic pollution in the Galapagos Islands and the Gulf Coast. Through these initiatives, HZI advances wildlife conservation locally and globally while engaging Houstonians in meaningful action.
$3,822,924 spentof which $2,790,863 as grants6% of program spendingThe Houston Zoo's Conservation Education Department engaged 725,235 participants in 2024 through camps, school partnerships, interpretive programs, and community outreach, fostering wildlife-saving actions. Key initiatives included: - Camp Zoofari: Immersive summer sessions for children ages 6-12, with 2,040 campers enrolled and scholarships provided to families with demonstrated financial need. - Zoo Crew Teen Program: Provided conservation skills training for 68 high school students, fostering leadership in wildlife conservation. (Continued on Schedule O) - School Partnerships and Free Field Trips: Supported 88,000 K-12 students through free field trips, with 80% from Title I schools, many in federally recognized Justice40 communities. Additionally, 17,359 college students from four local colleges visited for free, and 12,031 participants engaged in pre-scheduled programs, including Camp Zoofari, Zoo Crew, Overnights, Animal Encounters, and pro-bono Community Outreach. - On-Site Interpretation: Staff and volunteers facilitated 250,000 guest interactions, promoting conservation awareness through storytelling and demonstrations. These programs underscore HZI's commitment to…
$1,819,376 spent$736,069 earned by the program3% of program spending
The 3 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $60,634,657.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2017 to 2018, from $173M to $226M (+31%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2017 0% · 2018 0% · 2020 10% · 2021 21% · 2022 1% · 2023 1% · 2024 0%. Grants only. Government contracts and fees sit inside program revenue.
30% of Houston Zoo Inc’s revenue is contributions — more earned-revenue than three-quarters of its peers (67% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 0 of the last 8 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Chief executive
Lee Ehmke
President & CEO
Board chair
Joe Cleary
Board Chair
As listed on its FY2024 Form 990.
Who funds it, year by year
2017 → 2023: the base broadened from 42 funders to 74 funders, grant income rose $2.5M → $6.1M.
17 of 171 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 21% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
Left out of every figure on this page: $2.9M from 7 payers (the payer shares this organization's board, largest Houston Arts Alliance). These are real filings, and they are not money Houston Zoo Inc raised.
From the IRS filings of Houston Zoo Inc’s funders (the co-funder graph). Top 30 of 171 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
Houston Zoo Inc has a broad base — no single funder exceeds 16% of grant income, and it takes 6 funders to reach half.
the vertical line marks half of all grant income — 6 funders to its left
Largest funder’s share by year: 2017 36% · 2018 60% · 2019 20% · 2020 25% · 2021 14% · 2022 19% · 2023 31% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
47% of Houston Zoo Inc's funders are still giving 3 years after their first grant; 64% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
96% of Houston Zoo Inc's grant income comes from Texas funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $9.9M arriving through sponsors registered in 14 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
Houston Zoo Inc runs a healthier operating margin than half of the 235 animals nonprofits its size.
this organization peer median middle 50% of peers· 235 animals nonprofits $10M–$100M, FY2024
Government funding Houston Zoo Inc receives
Grants and contracts to this organization from federal (USASpending) and state checkbooks, reconciled to its EIN. $2.6M on record.
- Department of the Interior$2.4M
- Institute of Museum and Library Services$250k
Federal grants vs contracts are distinguished; state line items keep their reported category. Matched by name + geography (the BMF), so coverage is partial and precision-first.
Organizations like Houston Zoo Inc
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Texas
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
86% of spending goes to programs.
Governance
Public support
94%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Screen this organization
A dated, signed PDF of the compliance screen for Houston Zoo Inc: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds Houston Zoo Inc?
- Houston Zoo Inc (Texas) receives grants from 171 organizations whose IRS filings report $46,615,727 to it, the largest being DAN L DUNCAN FOUNDATION ($7,458,070). 109 of them have funded it in more than one year.
- How many funders does Houston Zoo Inc have?
- IRS filings report 171 organizations giving $46,615,727 in grants to Houston Zoo Inc, 109 of which have funded it in more than one year.
- Who is the largest funder of Houston Zoo Inc?
- DAN L DUNCAN FOUNDATION is the largest funder on record, with $7,458,070 in grants. The full list of funders is on this page.
- How can an organization like Houston Zoo Inc find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Texas. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2024 (financials across 2017–2024), and the filings of 171 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 22, 2026. What this page cannot tell you · view filing