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Maritime Explorium at Port Jeff Harbor

To be a leader in STEAM education, learning and innovation that will shape the intellect, social values and principles of current and future generations.The Explorium provides cutting edge, …

Childrens Maritime Museum at Port

Arts & Culture Prt Jefferson, NY EIN: 061723721 (IRS) Sign up to see website
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73
Integrity Assessment
Strong transparency
73/100 · methodology

About Maritime Explorium at Port Jeff Harbor

The organization develops and implements enriching, innovative and cutting STEM exhibits and programming on site at the Museum as well as in the community on Long Island and beyond. Their programs target all communities, especially in underserved, low-income, highly diverse populations. Their programs include, but are not limited to - Girls in STEM, special education, professional development for educators, environmental stewardship and awareness, Pre-K Little Sparks early childhood programs and Maker Faire Long Island.

Founded
Headquarters
Prt Jefferson, NY
Foundation type
Publicly-supported charity (509(a)(2))
NTEE code
A52
IRS subsection
501(c)(03)
Ruling date
Size
small

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 2005

Mission

To be a leader in STEAM education, learning and innovation that will shape the intellect, social values and principles of current and future generations.The Explorium provides cutting edge, inquiry-based learning experiences for P-12 students, state-of-the-art professional development for P-12 educators, and inventive design challenges for family groups all aimed at advancing the learning of concepts that translate into skills that address social, economic and environmental issues.

Focus areas & reach

· What they work on and where
Cause tags
SDG alignment The 17 UN Sustainable Development Goals (SDGs) are the global agenda for ending poverty, protecting the planet, and ensuring prosperity by 2030. We tag each charity to the goals its work advances.

How it stacks up against peers

· vs. 8 similar arts & culture in United States
Program spending This charity: 86%
Peer average: 76%
Integrity Assessment This charity: 73
Peer average: 90

Concerns

· None found
No red flags found
Screened for IRS revocation history, Open investigations, Governance scandals, Related-party deals, Excessive exec comp.

Where every $1 goes

· FY2024 · IRS 990 (FY2024)
$0.86
Program$0.86
86% to programs beats the peer average (76%) and beats the Charity Navigator "highly efficient" threshold (75%).

GiveRadar Analysis

Original analysis from GiveRadar's dataset of comparable organizations

From what GiveRadar has verified so far, Maritime Explorium at Port Jeff Harbor has a complete profile, cross-referenced across 3 independent sources including the IRS.

  • It has more complete governance disclosure than nearly all similar organizations, because GiveRadar has verified leadership, executive compensation, a mission statement and a founding date. See national comparisons
  • GiveRadar has verified more about this organization than about 78% of the 133,127 arts & culture charities in the United States it tracks, because GiveRadar has verified its financial disclosures and its registration. Most of those have little verified data on record yet. View this cohort
  • GiveRadar holds 5 years of financial filings for this organization, the most recent for fiscal year 2024. See the filings
GiveRadar has verified
  • government registration
  • financial records (5 filed years)
  • disclosed leadership
  • a website
  • third-party accreditation
Not yet verified by GiveRadar
  • a contact email
  • a donation page
  • an owner-submitted profile claim

Analysis based on GiveRadar's benchmark dataset of 2026-07-03. It describes what GiveRadar has verified, not a judgment of the organization itself.

Common questions

· Auto-generated from filings + methodology

Maritime Explorium at Port Jeff Harbor is a registered arts & culture nonprofit based in Prt Jefferson, NY, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 2004 and has been operating for 22 years. Its EIN is 061723721. According to GiveRadar's records, it holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. GiveRadar's Integrity Assessment for the organization is 73/100, which reflects how much public information is available, not whether the charity is legitimate. The organization reports $371K in annual revenue. 12 officers and directors are publicly disclosed. No red flags have been detected.

Maritime Explorium at Port Jeff Harbor's EIN (Employer Identification Number) is 061723721. This is the organization's IRS tax identification number; you can use it to verify tax-exempt status and to look up its Form 990 filings with the IRS.

Maritime Explorium at Port Jeff Harbor has a GiveRadar Integrity Assessment of 73/100. 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 73 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. The charity allocates 86% of expenses to programs, which contributes positively to its score. For comparison, the average integrity assessment for arts & culture charities in United States is 90/100.

Maritime Explorium at Port Jeff Harbor is located in Prt Jefferson, NY, United States. The organization was established in 2004 and has been active for 22 years. Its registered address is 101 E Broadway, United States.

Based on official tax filings, Maritime Explorium at Port Jeff Harbor has $371K in annual revenue. It allocates 86% of expenses to programs and services. This is above the average of 76% for arts & culture charities in United States. 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.

Maritime Explorium at Port Jeff Harbor is classified as an 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 $371K in annual revenue. The organization has 12 disclosed officers and directors.

No red flags have been detected for Maritime Explorium at Port Jeff Harbor. GiveRadar automatically screens charities for concerning patterns including high executive compensation, low program spending, and missing financial filings. Based on available official data, no issues have been identified.

According to GiveRadar's records, Maritime Explorium at Port Jeff Harbor holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. It is registered with the Internal Revenue Service (IRS). It reports that 86% of expenses go to programs (the peer average is 76%). GiveRadar provides data for research and does not endorse any organization. A GiveRadar Integrity Assessment reflects how much public data is available, not whether an organization is safe to donate to, so it is always smart to do your own research before giving.

The organization develops and implements enriching, innovative and cutting STEM exhibits and programming on site at the Museum as well as in the community on Long Island and beyond. Their programs target all communities, especially in underserved, low-income, highly diverse populations. Their programs include, but are not limited to - Girls in STEM, special education, professional development for educators, environmental stewardship and awareness, Pre-K Little Sparks early childhood programs and Maker Faire Long Island. Maritime Explorium at Port Jeff Harbor is classified as an arts & culture organization registered in United States. The organization was founded in 2004.

Among arts & culture charities registered in United States: It allocates 86% of expenses to programs, above the peer average of 76%. Its annual revenue of $371K is below the peer average of $1M.

Yes, donations to Maritime Explorium at Port Jeff Harbor are generally tax-deductible in the United States. Maritime Explorium at Port Jeff Harbor is a 501(c)(3) tax-exempt organization. Its EIN is 061723721, 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.

Annual revenue
$100K-$1M
86% to programs
Source: IRS 990 (FY2024) why this matters
Unlock exact figures

Filing history

5 years on file from IRS 990 (FY2024): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2024, FY2023, FY2022, FY2021, FY2020.
Financial details are free - with a GiveRadar account

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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.

Staff & volunteers

From filings and published profiles

Employees
20

Leadership

From FY2024 filing

KA
Kathleen d• R•••••••
President

Officers & trustees (4)

Source: Public filings

See full names, roles, and stories

4 officers and trustees on file - free with a GiveRadar account.

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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
$0.4M revenue
FY2024
IRS 990
Form filed
$0.3M revenue
FY2023
IRS 990
Form filed
$0.2M revenue
FY2022
IRS 990
Form filed
$0.3M revenue
FY2021
IRS 990
Form filed
$0.2M revenue
FY2020
IRS 990

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Cause areas in United States

How many charities work in each area, with this charity's area highlighted.

Human Services 322,679
Education 195,586
Arts & Culture this charity 133,128
Advocacy & Civil Rights 128,026
Religion 114,636
Health 98,862
Community Development 56,086
Youth Development 53,450
See all cause areas in United States

Most common causes in United States

Causes charities work on most.

Community Development 235,146
Education 159,016
Religion 103,741
Arts & Culture 101,203
Human Rights 76,926
Health 65,250
Youth Development 47,775
Animal Welfare 32,425

Sources and verification

Registration and legal identity
Internal Revenue Service (IRS) - Tax Exempt Organization Search
Financial filings
IRS Form 990 filings - Fiscal year 2024 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 12 disclosed in the public registry.
Supplementary verification
Charity Navigator

Data freshness

Last updated
Jun 12, 2026
Registry checked
Jun 6, 2026
Profile completeness
75%

What we know and don't know

Exactly which public data we hold on this charity. Our score reflects transparency, not impact.

On record · 9
  • Financial data · FY2024 on record
  • Named leadership · 12 officers on file
  • Government registration · Registered with an official registry
  • Mission statement · Published
  • Official website · On record
  • Headquarters address · On file
  • Direct contact · Email or phone published
  • Tax-deductibility · Verified
  • Founding date · 2004
Not available · 2
  • Executive pay
    Top-officer pay not disclosed
  • Programs & activities
    No named programs listed by the charity

Methodology

GiveRadar builds each profile primarily from official government charity registries, supplemented where available by third-party nonprofit databases and news archives, and combines it into a single 0-100 integrity assessment. The exact sources for this charity are listed above. We don't take a cut of any donation, ever.

Read full methodology

Are you the owner or a board member?

If you represent this organization and want to correct or update its data, you can claim this listing to edit details yourself, or email [email protected] with the correct information. We review every request and respond within 30 days.

Quick facts about Maritime Explorium at Port Jeff Harbor

What is Maritime Explorium at Port Jeff Harbor?
Maritime Explorium at Port Jeff Harbor is a arts & culture publicly-supported charity (509(a)(2)) based in Prt Jefferson, United States. The organization develops and implements enriching, innovative and cutting STEM exhibits and programming on site at the Museum as well as in the community on Long Island and beyond. Their programs target all communities, especially in underserved, low-income, highly diverse populations. Their programs include, but are not limited to - Girls in STEM, special education, professional development for educators, environmental stewardship and awareness, Pre-K Little Sparks early childhood programs and Maker Faire Long Island.
When was Maritime Explorium at Port Jeff Harbor founded?
Maritime Explorium at Port Jeff Harbor was founded in 2004.
Who leads Maritime Explorium at Port Jeff Harbor?
Kathleen de Riesthal serves as President.
Where is Maritime Explorium at Port Jeff Harbor located?
Headquartered in Prt Jefferson, NY, United States.
What is Maritime Explorium at Port Jeff Harbor's annual budget?
Annual revenue for fiscal year 2024 is approximately $100K-$1M. 86% of expenses go to program services.
Is Maritime Explorium at Port Jeff Harbor trustworthy?
Maritime Explorium at Port Jeff Harbor has a GiveRadar Integrity Assessment of 73 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 Maritime Explorium at Port Jeff Harbor's registration number?
IRS EIN: 061723721.
What is Maritime Explorium at Port Jeff Harbor's website?
https://www.longislandexplorium.org