Charities United States Arts & Culture Maine Natural History Observatory
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Maine Natural History Observatory

Natural history observation

Arts & Culture Gouldsboro, ME EIN 200718450 · IRS Sign up to see website
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83
Integrity Assessment
Strong transparency
83/100 · methodology

About Maine Natural History Observatory

Maine Natural History Observatory (MNHO) is a nonprofit research organization in Downeast Maine dedicated to documenting, studying, and sharing knowledge about Maine’s plants, animals, and ecosystems. Through scientific research, long-term monitoring, and data archiving, MNHO is working to build a comprehensive understanding of the state’s biodiversity and natural history. The Observatory collaborates with conservation organizations, volunteers, and agencies to collect high-quality biological data, develop natural history educational tools, and make natural history information accessible to scientists, educators, and the public. Its mission is to advance the conservation of Maine’s natural resources by providing reliable data and fostering a deeper appreciation for the state’s rich ecological diversity.

Founded
Headquarters
Gouldsboro, ME
Foundation type
Publicly-supported charity (509(a)(2))
NTEE code
A80
IRS subsection
501(c)(03)
Ruling date
Size
small

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 2004

Mission

Natural history observation

Focus areas & reach

· What they work on and where
Arts & Culture · NTEE A80
Cause tags

How it stacks up against peers

· vs. 8 similar arts & culture in United States
Program spending This charity: 0%
Peer average: 93%
CEO comp as % of revenue This charity: 10.23%
Peer average: 0.48%
Integrity Assessment This charity: 83
Peer average: 93

Red flags

· 1 item
High Executive Pay
Top executive compensation is 13.0% of total expenses ($35,650 of $273,707).

Common questions

· Auto-generated from filings + methodology

Maine Natural History Observatory is a registered arts & culture nonprofit based in Gouldsboro, ME, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 2003 and has been operating for 23 years. Its EIN is 200718450. It has a GiveRadar Integrity Assessment of 83/100 (Strong transparency), indicating well-documented governance, financials, and contact details. This is below the average of 93/100 for arts & culture charities in United States. The organization reports $349K in annual revenue. 27 officers and directors are publicly disclosed. GiveRadar has identified 1 potential concern.

Maine Natural History Observatory has a GiveRadar Integrity Assessment of 83/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 83 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. For comparison, the average integrity assessment for arts & culture charities in United States is 93/100.

Maine Natural History Observatory is located in Gouldsboro, ME, United States. The organization was established in 2003 and has been active for 23 years.

Based on official tax filings, Maine Natural History Observatory has $349K in annual revenue. Its revenue is below the peer average of $1M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

Maine Natural History Observatory is classified as a Arts & Culture organization, registered in United States. It operates as a Publicly-supported charity (509(a)(2)). By size, it is categorized as a small organization. It has $349K in annual revenue. The organization has 27 disclosed officers and directors.

GiveRadar has identified 1 potential concern for Maine Natural History Observatory. Red flags are automatically detected from official data and may include high executive compensation relative to budget, low program spending, or missing financial filings. Red flags do not necessarily mean wrongdoing but indicate areas that may warrant further review before donating.

Maine Natural History Observatory has a GiveRadar Integrity Assessment of 83/100 (Strong transparency), which suggests it is a well-documented organization. It is regulated by the IRS. You can donate directly through their official donation page linked on their GiveRadar profile. GiveRadar provides data for research purposes and does not endorse any organization. Always do your own due diligence.

Maine Natural History Observatory (MNHO) is a nonprofit research organization in Downeast Maine dedicated to documenting, studying, and sharing knowledge about Maine’s plants, animals, and ecosystems. Through scientific research, long-term monitoring, and data archiving, MNHO is working to build a comprehensive understanding of the state’s biodiversity and natural history. The Observatory collaborates with conservation organizations, volunteers, and agencies to collect high-quality biological data, develop natural history educational tools, and make natural history information accessible to scientists, educators, and the public. Its mission is to advance the conservation of Maine’s natural resources by providing reliable data and fostering a deeper appreciation for the state’s rich ecological diversity. Maine Natural History Observatory is classified as a arts & culture organization registered in United States. The organization was founded in 2003.

Among arts & culture charities registered in United States: Maine Natural History Observatory's GiveRadar Integrity Assessment of 83/100 is below the peer average of 93/100. Its annual revenue of $349K is below the peer average of $1M.

Yes, donations to Maine Natural History Observatory are generally tax-deductible in the United States. Maine Natural History Observatory is a 501(c)(3) tax-exempt organization. Its EIN is 200718450, which you can use for tax filing purposes. Donors can typically deduct contributions on their federal income tax return if they itemize deductions. Consult a tax professional for guidance specific to your situation.

Verified against 4 official sources, last refreshed .

Annual revenue
$100K-$1M
0% to programs
Source: IRS 990 (FY2025) why this matters
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Filing history

5 years on file from IRS 990 (FY2025): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2025, FY2024, FY2023, FY2022, FY2021.
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Taxes

Tax-deductibility for donors

Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.

Always confirm tax treatment with the charity directly or your tax advisor before donating.

Leadership

GL
Glen Mittelhauser
Treasurer/Exec Dir

Officers & trustees (8)

Source: Public filings

BO
Bob D••••••••
Director
GL
Glen M•••••••••••
TREASURER/EX
JA
Jacob V•• D• S••••
Director
JI
Jill W•••••
Director
JO
Jordan C•••••••
Director
ME
Megan M••••••
SECRETARY
RI
Rich M••••••••
PRESIDENT
SC
Scott S••••
Director
Full names, contact details & compensation

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Latest news

From global news sources

No recent news coverage found

News coverage will appear here when articles mention this organization.

Activity timeline

Filings and press mentions, merged

Form filed
$0.3M revenue
FY2025
IRS_990
Form filed
$0.4M revenue
FY2024
IRS_990
Form filed
$0.2M revenue
FY2023
IRS_990
Form filed
$0.2M revenue
FY2022
IRS_990
Form filed
$0.1M revenue
FY2021
IRS_990

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Peer charities

Other arts & culture in United States, by integrity assessment

Charity Score Revenue Program %
Maine Natural History Observatory This page 83 $348,525 -
Paris Community Theater 93 $316,442 100%
Taylor Music Group 93 $100,949 83%
Chinese Center on Long Island Inc 93 $228,712 100%
Boston Festival Orchestra Inc 93 $215,316 94%
Oregon Arts Watch 93 $304,412 84%
Orchestra Santa Monica 93 $329,123 81%
Methow Music Festival Association 93 $217,431 100%
Border Crossing 93 $261,798 100%

Sources and verification

Refreshed

Registration and legal identity
Internal Revenue Service (IRS) - Tax Exempt Organization Search
Financial filings
IRS Form 990 filings - Fiscal year 2025 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 27 disclosed in the public registry.
Supplementary verification
Charity Navigator

Data freshness

Last updated
May 27, 2026
Profile completeness
90%

What we don't know

Honest gaps - our score reflects transparency, not impact

Programs & projects
No named programs listed by the charity
Operating reach
Countries where programs run not specified

Methodology

GiveRadar combines public registry filings, ProPublica Nonprofit Explorer, Charity Navigator, GuideStar, and news archives into a single 0-100 integrity assessment. We don't take a cut of any donation, ever.

Read full methodology

Quick facts about Maine Natural History Observatory

What is Maine Natural History Observatory?
Maine Natural History Observatory is a arts & culture publicly-supported charity (509(a)(2)) based in Gouldsboro, United States. Maine Natural History Observatory (MNHO) is a nonprofit research organization in Downeast Maine dedicated to documenting, studying, and sharing knowledge about Maine’s plants, animals, and ecosystems. Through scientific research, long-term monitoring, and data archiving, MNHO is working to build a comprehensive understanding of the state’s biodiversity and natural history. The Observatory collaborates with conservation organizations, volunteers, and agencies to collect high-quality biological data, develop natural history educational tools, and make natural history information accessible to scientists, educators, and the public. Its mission is to advance the conservation of Maine’s natural resources by providing reliable data and fostering a deeper appreciation for the state’s rich ecological diversity.
When was Maine Natural History Observatory founded?
Maine Natural History Observatory was founded in 2003.
Who leads Maine Natural History Observatory?
Glen Mittelhauser serves as Treasurer/Exec Dir.
Where is Maine Natural History Observatory located?
Headquartered in Gouldsboro, United States.
What is Maine Natural History Observatory's annual budget?
Annual revenue for fiscal year 2025 is approximately $100K-$1M. 0% of expenses go to program services.
Is Maine Natural History Observatory trustworthy?
Maine Natural History Observatory has a GiveRadar Integrity Assessment of 83 out of 100 (Strong transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
What is Maine Natural History Observatory's registration number?
IRS EIN: 200718450.
What is Maine Natural History Observatory's website?
http://www.mainenaturalhistory.org