Home Countries United States Environment Marin Conservation League
Marin Conservation League logo

Marin Conservation League

The mission of marin conservation league is to preserve, protect and enhance the natural assets of marin in a changing environment.

Environment San Rafael, CA EIN: 946089780 (IRS) Sign up to see website
Claim this charity
Ready to give?
100% goes to Marin Conservation League

GiveRadar doesn't take a cut. Donate directly on their site.

Make your donation
86
Integrity Assessment
Strong transparency
86/100 · methodology

About Marin Conservation League

Since 1934, MCL has worked to acquire and preserve some of Marin's defining public lands. We advocate for the treasured natural and cultural resources of Marin.

Founded
Headquarters
San Rafael, CA
Foundation type
Supporting organization (509(a)(3))
NTEE code
C300
IRS subsection
501(c)(03)
Ruling date
Size
medium

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1953

Mission

The mission of marin conservation league is to preserve, protect and enhance the natural assets of marin in a changing environment.

Focus areas & reach

· What they work on and where

How it stacks up against peers

· vs. 8 similar environment in United States
Program spending This charity: 75%
Peer average: 72%
Integrity Assessment This charity: 86
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

· FY2025 · IRS 990 (FY2025)
$0.75
Program$0.75
75% to programs beats the peer average (72%) and beats the Charity Navigator "highly efficient" threshold (75%).

GiveRadar Analysis

Original analysis from GiveRadar's dataset of comparable organizations

GiveRadar's verified records show Marin Conservation League with a complete profile, cross-referenced across 3 independent sources including the IRS.

  • Established in 1940, it is among the oldest environment charities in the United States GiveRadar tracks. View this cohort
  • GiveRadar holds a more complete profile for this organization than for 98% of the 30,143 environment 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 6 years of financial filings for this organization, the most recent for fiscal year 2025 - a deeper filing history than 90% of the 13,585 environment charities in the United States with filings on record. See the filings
GiveRadar has verified
  • government registration
  • financial records (6 filed years)
  • disclosed leadership
  • a website
  • a contact email
  • a donation page
Not yet verified by GiveRadar
  • 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

Marin Conservation League is a registered environment nonprofit based in San Rafael, CA, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1940 and has been operating for 86 years. Its EIN is 946089780. 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 86/100, which reflects how much public information is available, not whether the charity is legitimate. The organization reports $686K in annual revenue. 92 officers and directors are publicly disclosed. No red flags have been detected.

Marin Conservation League's EIN (Employer Identification Number) is 946089780. 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.

Marin Conservation League has a GiveRadar Integrity Assessment of 86/100. 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 86 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. The charity allocates 75% of expenses to programs, which contributes positively to its score. For comparison, the average integrity assessment for environment charities in United States is 90/100.

Marin Conservation League is located in San Rafael, CA, United States. The organization was established in 1940 and has been active for 86 years.

Based on official tax filings, Marin Conservation League has $686K in annual revenue. It allocates 75% of expenses to programs and services. This is in line with the average of 72% for environment charities in United States. Its revenue is below the peer average of $2M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

Marin Conservation League is classified as an Environment organization, registered in United States. It operates as a Supporting organization (509(a)(3)). By size, it is categorized as a medium organization. It has $686K in annual revenue. The organization has 92 disclosed officers and directors.

No red flags have been detected for Marin Conservation League. 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, Marin Conservation League 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 75% of expenses go to programs (the peer average is 72%). You can donate directly through their official donation page linked on their GiveRadar profile. 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.

Since 1934, MCL has worked to acquire and preserve some of Marin's defining public lands. We advocate for the treasured natural and cultural resources of Marin. Marin Conservation League is classified as an environment organization registered in United States. The organization was founded in 1940.

Among environment charities registered in United States: It allocates 75% of expenses to programs, in line with the peer average of 72%. Its annual revenue of $686K is below the peer average of $2M.

Yes, donations to Marin Conservation League are generally tax-deductible in the United States. Marin Conservation League is a 501(c)(3) tax-exempt organization. Its EIN is 946089780, 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
75% to programs
Source: IRS 990 (FY2025) why this matters
Unlock exact figures

Filing history

6 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, FY2020.
Financial details are free - with a GiveRadar account

See 5 years of revenue, expense breakdowns, and balance sheet.

Sign up to view
Already have an account? Log in
No credit card · Takes 20 seconds

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
3

Leadership

From FY2025 filing

RI
Richard J•••••
Treasurer

Officers & trustees (25)

Source: Public filings

See full names, roles, and stories

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

Already have an account? Log in
Sign up to view

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
$0.7M revenue
FY2025
IRS 990
Form filed
$0.8M revenue
FY2024
IRS 990
Form filed
$0.3M revenue
FY2023
IRS 990
Form filed
$0.5M revenue
FY2022
IRS 990
Form filed
$0.5M revenue
FY2021
IRS 990
Form filed
$0.7M revenue
FY2020
IRS 990

No reviews yet. Be the first to share your experience.

Have you donated or volunteered here?

Share your experience - it takes 30 seconds. Verified reviews help other donors decide.

Sign up to write a review

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 133,128
Advocacy & Civil Rights 128,026
Religion 114,636
Health 98,862
Community Development 56,086
Youth Development 53,450
Environment this charity 30,143
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 2025 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 92 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 · FY2025 on record
  • Named leadership · 92 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 · 1940
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 Marin Conservation League

What is Marin Conservation League?
Marin Conservation League is a environment supporting organization (509(a)(3)) based in San Rafael, United States. Since 1934, MCL has worked to acquire and preserve some of Marin's defining public lands. We advocate for the treasured natural and cultural resources of Marin.
When was Marin Conservation League founded?
Marin Conservation League was founded in 1940.
Who leads Marin Conservation League?
Richard Jensen serves as Treasurer.
Where is Marin Conservation League located?
Headquartered in San Rafael, CA, United States.
What is Marin Conservation League's annual budget?
Annual revenue for fiscal year 2025 is approximately $100K-$1M. 75% of expenses go to program services.
Is Marin Conservation League trustworthy?
Marin Conservation League has a GiveRadar Integrity Assessment of 86 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 Marin Conservation League's registration number?
IRS EIN: 946089780.
What is Marin Conservation League's website?
http://marinconservationleague.org