Maine · Nonprofit
Islesboro Islands Trust
Islesboro Islands Trust (Maine) receives grants from 25 organizations whose IRS filings report $1,515,395 to it, the largest being CLARENCE & ANNE DILLON DUNWALKE TRUST ($654,000). 18 of them have funded it in more than one year.
- Revenue FY2025
- $598k
- Funders on record
- 25
- Grants received
- $1.5M
- Net assets
- $5.3M
What Islesboro Islands Trust does
Mission
The mission of Islesboro Islands Trust is to enhance the quality of residents' lives through the preservation of open space, educate all residents as to the value of the island's natural ecosystems, and act as an environmental advocate on behalf of Islesboro and the surrounding Penobscot Bay region.
As stated on its FY2025 Form 990.
Programs
Islesboro Islands Trust (IIT) continued agricultural efforts at the Blueberry Hill Preserve, reviving over 4 acres of native blueberry barrens and expanding a heritage apple orchard. We undertook other improvements to preserves and constructed a new .5 mile spur on our existing Broad Point trail, equaling 14.5 miles of trails. We also constructed 100 feet of raised bog bridging and another 100 feet of plank bridging through wet areas of the Broad Point and Blueberry Hill Trails.
$212,845 spent83% of program spendingIIT continued to oppose development of an offshore wind facility on Sears Island, as well as related efforts to prevent industrialization of Sears Island.IIT also supported the creation of a Penobscot Bay Waterkeeper and continued to participate in and support the statewide Environmental Priorities Coalition. IIT was asked and became a member of the Maine Land Trust Network steering committee and continues to be involved in the Town of Islesboro Sea Level Rise Committee.
$29,328 spent11% of program spendingIIT continued to provide engaging and substantive programming for all ages in the Islesboro community at no cost to participants. We maintained relationships with the Islesboro Preschool, Islesboro Central School, and Islesboro Community Center's Kids Club, as well as the Alice Pendleton Library and the Town of Islesboro Adventure.IIT provided regular Nature Walks & Talks on a variety of topics, as well as family-friendly and community-oriented workshops and event.
$12,902 spent5% of program spending
The 3 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $255,075.
The organization over time
Each line starts at 100 in 2019, so what you read is the shape rather than the size: 150 means half as much again as 2019, 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 2019 to 2020, from $3.0M to $4.1M (+36%).
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.
93% of Islesboro Islands Trust’s revenue is contributions — more donation-reliant than the typical peer (87% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 7 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.
Who funds it, year by year
2017 → 2023: the base broadened from 5 funders to 11 funders, grant income rose $17k → $174k.
8 of 25 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 23% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of Islesboro Islands Trust’s funders (the co-funder graph). 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
Islesboro Islands Trust leans on a few funders — its largest provides 43% of grant income and the top three 64%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
Largest funder’s share by year: 2017 65% · 2018 41% · 2019 53% · 2020 26% · 2021 33% · 2022 36% · 2023 43% — 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
53% of Islesboro Islands Trust's funders are still giving 3 years after their first grant; 72% 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
Islesboro Islands Trust draws 100% of its grant income from funders outside Maine, across 12 states in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $356k arriving through sponsors registered in 6 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
Islesboro Islands Trust runs a healthier operating margin than three-quarters of the 4,505 philanthropy nonprofits its size.
this organization peer median middle 50% of peers· 4,505 philanthropy nonprofits $100k–$1M, FY2025
Organizations like Islesboro Islands Trust
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 Maine
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
77% of spending goes to programs.
Governance
Public support
80%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for Islesboro Islands Trust: 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 Islesboro Islands Trust?
- Islesboro Islands Trust (Maine) receives grants from 25 organizations whose IRS filings report $1,515,395 to it, the largest being CLARENCE & ANNE DILLON DUNWALKE TRUST ($654,000). 18 of them have funded it in more than one year.
- How many funders does Islesboro Islands Trust have?
- IRS filings report 25 organizations giving $1,515,395 in grants to Islesboro Islands Trust, 18 of which have funded it in more than one year.
- Who is the largest funder of Islesboro Islands Trust?
- CLARENCE & ANNE DILLON DUNWALKE TRUST is the largest funder on record, with $654,000 in grants. The full list of funders is on this page.
- How can an organization like Islesboro Islands Trust find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Maine. 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 FY2025 (financials across 2019–2025), and the filings of 25 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