MAINE NATURAL HISTORY OBSERVATORY

EIN 20-0718450 GOULDSBORO, ME

Revenue 2024: $348,525
Expenses 2024: $273,707

Program services were 88.2% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection: 03
NTEE code: A80
Classification: 2000
Street: 317 GUZZLE RD

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Mission and programs · 2024

Mission

NATURAL HISTORY OBSERVATION

INCREASE KNOWLEDGE OF BIRD POPULATIONS IN MAINE THROUGH FIELD EFFORTS AND PUBLICATIONS

Expenses $140,537 · Revenue $213,761
INCREASE KNOWLEDGE OF THE VASCULAR FLORA, RARE AND INVASIVE PLANTS IN MAINE THROUGH FIELD EFFORTS AND PUBLICATIONS

Expenses $83,760
CATALOG AND PUBLISH DETAILS REGARDING SIGNIFICANT MUSEUM COLLECTIONS PERTAINING TO MAINE

Expenses $17,019

As filed on the 2024 return.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

Glen MittelhauserGLEN MITTELHAUSER

TREASURER/EX

Total calculated

$38,396

From this org

$38,396

From related orgs

$0

Other

$0

Hours/week

40
Rich MacDonaldRICH MACDONALD

PRESIDENT

Total calculated

$0
Jordan ChalfantJORDAN CHALFANT

SECRETARY

Total calculated

$0
Megan McOskerMEGAN MCOSKER

DIRECTOR

Total calculated

$0
Jacob Van De SandeJACOB VAN DE SANDE

DIRECTOR

Total calculated

$0
Bob DeforrestBOB DEFORREST

DIRECTOR

Total calculated

$0
Jill WebberJILL WEBBER

DIRECTOR

Total calculated

$0

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

2024

Revenue

$348,525

Expenses

$273,707

Contributions

$134,620

Grants paid

$0
2023

Revenue

$386,775

Expenses

$232,742

Contributions

$185,429

Grants paid

$0
2022

Revenue

$198,121

Expenses

$199,149

Contributions

$70,824

Grants paid

$0

Tax year	Revenue	Expenses	Contributions	Grants paid
2024	$348,525	$273,707	$134,620	$0
2023	$386,775	$232,742	$185,429	$0
2022	$198,121	$199,149	$70,824	$0

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

2021 · 990

Revenue

$178,093

Expenses

$184,382

Assets (EOY)

$44,380
2020 · 990

Revenue

$143,614

Expenses

$138,755

Assets (EOY)

$48,656
2019 · 990

Revenue

$165,570

Expenses

$194,821

Assets (EOY)

$46,505
2018 · 990

Revenue

$266,280

Expenses

$226,983

Assets (EOY)

$75,969
2017 · 990

Revenue

$195,920

Expenses

$195,348

Assets (EOY)

$36,608
2016 · 990

Revenue

$207,435

Expenses

$191,893

Assets (EOY)

$36,116
2015 · 990-EZ

Revenue

$150,487

Expenses

$180,016

Assets (EOY)

$18,108
2013 · 990-EZ

Revenue

$88,693

Expenses

$111,850

Assets (EOY)

$5,873
2012 · 990-EZ

Revenue

$140,040

Expenses

$133,044

Assets (EOY)

$29,016

Tax year	Form	Revenue	Expenses	Assets (EOY)
2021	990	$178,093	$184,382	$44,380
2020	990	$143,614	$138,755	$48,656
2019	990	$165,570	$194,821	$46,505
2018	990	$266,280	$226,983	$75,969
2017	990	$195,920	$195,348	$36,608
2016	990	$207,435	$191,893	$36,116
2015	990-EZ	$150,487	$180,016	$18,108
2013	990-EZ	$88,693	$111,850	$5,873
2012	990-EZ	$140,040	$133,044	$29,016

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

MAINE COMMUNITY FOUNDATION INC

$59,560

2023 Historical Organizations
FRIENDS OF ACADIA

$9,817

2023 Conservation
NATURE CONSERVANCY

$7,395

2023 CONSERVATION ACTIVITIES
FRIENDS OF ACADIA

$7,180

2024 Conservation
THE DOWNEAST CHAPTER OF MAINE AUDUBON

$7,000

2022
EASTERN MAINE CONSERVATION INITIATIVE

$6,400

2024 Protect Downeast Project
FIDELITY INVESTMENTS CHARITABLE GIFT FUND

$5,820

2023 For grant recipient's exempt purposes
THE DOWNEAST CHAPTER OF MAINE AUDUBON

$1,000

2023
THE DOWNEAST CHAPTER OF MAINE AUDUBON

$1,000

2024

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.