Home Countries United States Arts & Culture Humboldt County Historical Society
Humboldt County Historical Society logo

Humboldt County Historical Society

Acquiring, creating, preserving interpreting, and disseminating historic information and assisting others to do the same.

Humboldt Historical Society

Arts & Culture Eureka, CA EIN: 237335930 (IRS) Reg: 23-7335930 (IRS) Sign up to see website
Claim this charity
Ready to give?
100% goes to Humboldt County Historical Society

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

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

About Humboldt County Historical Society

Create, Publish, and distribute a quarterly magazine, "The Humboldt County Historian", etc. This magazine includes articles that are based on and describe Northern California and Humboldt County History. It is sent to approximately 4,000 members. Collect, sort, index, and store archival documents and photos wich are viewed, studied, and researched by members, journalist, students, and the general public. To promote and publicize the functions and services of the society to schools, historical groups and the general public. This is accomplished through school visits, articles in the local paper, monthly programs and maintenance of a website.

Founded
Headquarters
Eureka, CA
Foundation type
Publicly-supported charity (509(a)(2))
NTEE code
A82Z
IRS subsection
501(c)(03)
Ruling date
Size
small

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1975

Mission

Acquiring, creating, preserving interpreting, and disseminating historic information and assisting others to do the same.

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: 75%
Peer average: 76%
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 Charity Navigator "highly efficient" threshold (75%).

GiveRadar Analysis

Original analysis from GiveRadar's dataset of comparable organizations

GiveRadar's verified records show Humboldt County Historical Society with a complete profile, cross-referenced across 3 independent sources including the IRS.

  • GiveRadar holds a more complete profile for this organization than for 97% 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
  • It has more complete contact information than nearly all similar organizations, with a verified website, email, phone and address on record. See national comparisons
  • 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
  • government registration
  • financial records (5 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

Humboldt County Historical Society is a registered arts & culture nonprofit based in Eureka, CA, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1975 and has been operating for 51 years. Its EIN is 237335930. 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 $187K in annual revenue. 28 officers and directors are publicly disclosed. No red flags have been detected.

Humboldt County Historical Society's EIN (Employer Identification Number) is 237335930. 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.

Humboldt County Historical Society 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 arts & culture charities in United States is 90/100.

Humboldt County Historical Society is located in Eureka, CA, United States. The organization was established in 1975 and has been active for 51 years.

Based on official tax filings, Humboldt County Historical Society has $187K in annual revenue. It allocates 75% of expenses to programs and services. This is in line with 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.

Humboldt County Historical Society 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 $187K in annual revenue. The organization has 28 disclosed officers and directors.

No red flags have been detected for Humboldt County Historical Society. 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, Humboldt County Historical Society 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 76%). 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.

Create, Publish, and distribute a quarterly magazine, "The Humboldt County Historian", etc. This magazine includes articles that are based on and describe Northern California and Humboldt County History. It is sent to approximately 4,000 members. Collect, sort, index, and store archival documents and photos wich are viewed, studied, and researched by members, journalist, students, and the general public. To promote and publicize the functions and services of the society to schools, historical groups and the general public. This is accomplished through school visits, articles in the local paper, monthly programs and maintenance of a website. Humboldt County Historical Society is classified as an arts & culture organization registered in United States. The organization was founded in 1975.

Among arts & culture charities registered in United States: It allocates 75% of expenses to programs, in line with the peer average of 76%. Its annual revenue of $187K is below the peer average of $1M.

Yes, donations to Humboldt County Historical Society are generally tax-deductible in the United States. Humboldt County Historical Society is a 501(c)(3) tax-exempt organization. Its EIN is 237335930, 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

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.
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
6

Leadership

From FY2025 filing

JA
Jack I•••••
Treasurer

Officers & trustees (14)

Source: Public filings

See full names, roles, and stories

14 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
$0.2M revenue
FY2025
IRS 990
Form filed
$0.2M revenue
FY2024
IRS 990
Form filed
$0.2M revenue
FY2023
IRS 990
Form filed
$0.2M revenue
FY2022
IRS 990
Form filed
$0.2M revenue
FY2021
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 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, with this charity's causes ticked.

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 - 28 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 · 28 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 · 1975
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 Humboldt County Historical Society

What is Humboldt County Historical Society?
Humboldt County Historical Society is a arts & culture publicly-supported charity (509(a)(2)) based in Eureka, United States. Create, Publish, and distribute a quarterly magazine, "The Humboldt County Historian", etc. This magazine includes articles that are based on and describe Northern California and Humboldt County History. It is sent to approximately 4,000 members. Collect, sort, index, and store archival documents and photos wich are viewed, studied, and researched by members, journalist, students, and the general public. To promote and publicize the functions and services of the society to schools, historical groups and the general public. This is accomplished through school visits, articles in the local paper, monthly programs and maintenance of a website.
When was Humboldt County Historical Society founded?
Humboldt County Historical Society was founded in 1975.
Who leads Humboldt County Historical Society?
Jack Irvine serves as Treasurer.
Where is Humboldt County Historical Society located?
Headquartered in Eureka, CA, United States.
What is Humboldt County Historical Society's annual budget?
Annual revenue for fiscal year 2025 is approximately $100K-$1M. 75% of expenses go to program services.
Is Humboldt County Historical Society trustworthy?
Humboldt County Historical Society 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 Humboldt County Historical Society's registration number?
IRS EIN: 237335930. Registration: 23-7335930 (United States).
What is Humboldt County Historical Society's website?
http://www.humboldthistory.org