Museum Of Sonoma County

Santa Rosa, CA
Tax-exempt since Sept. 1978
EIN: 94-2506626

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Type of Nonprofit

Designated as a 501(c)(3) Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Category: Arts, Culture and Humanities / History Museums (NTEE)

Donations to this organization are tax deductible.

Revenue

$1.63M (2023)

Expenses

$1.32M (2023)

Total Assets

$8.51M (2023)

Total Liabilities

$78.8k (2023)

Source: Form 990 tax filings from 2011 to 2023

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. If this organization filed an amended return, it may not be reflected below. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Form 990 data is from the IRS.

Fiscal Year Ending Dec.
2023

Revenue

$1,627,226

Expenses

$1,319,013

Net Income

$308,213

Net Assets

$8,428,308

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$1,179,609	72.5%
Program Services	$174,561	10.7%
Investment Income	$122,821	7.5%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$18,988	1.2%
Net Fundraising	-$15,515
Sales of Assets	$135,283	8.3%
Net Inventory Sales	$5,367	0.3%
Other Revenue	$6,112	0.4%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$161,026	12.2%
Professional Fundraising Fees	$0
Other Salaries and Wages	$575,059	43.6%

Assets/Debt
Total Assets	$8,507,071
Total Liabilities	$78,763
Net Assets	$8,428,308

Compensation

Key Employees and Officers	Compensation	Related	Other
Jeff Nathanson (Executive Director)	$161,031	$0	$0
Nancy Glaze (Chair)	$0	$0	$0
Henry Beaumont (Treasurer)	$0	$0	$0
Estelle H Rogers (Secretary)	$0	$0	$0
Noreen Carvolth (Director)	$0	$0	$0
Raissa De La Rosa (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
Jeremy Nichols (Director)	$0	$0	$0
Ernesto Olivares (Director)	$0	$0	$0
Staci Pastis (Vice Chair Ended 10/1/23)	$0	$0	$0
Margaret Purser (Director)	$0	$0	$0
David Salm (Director)	$0	$0	$0
Diane Sotos (Director)	$0	$0	$0
Richard Tempero Dds Md (Director)	$0	$0	$0
Nancy Wang (Director)	$0	$0	$0
Chris Nugent (Board Member)	$0	$0	$0
Anne Peterson (Board Member)	$0	$0	$0
Melanie Jones Carter (Vice Chair As Of 10/1/23)	$0	$0	$0

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990

Filed on May 27, 2025

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Fiscal Year Ending Dec.
2022

Revenue

$1,204,897

Expenses

$1,443,373

Net Income

-$238,476

Net Assets

$7,144,071

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$940,742	78.1%
Program Services	$57,684	4.8%
Investment Income	$91,597	7.6%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	-$157
Net Fundraising	-$30,333
Sales of Assets	$135,961	11.3%
Net Inventory Sales	$3,573	0.3%
Other Revenue	$5,830	0.5%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$162,829	11.3%
Professional Fundraising Fees	$0
Other Salaries and Wages	$603,195	41.8%

Assets/Debt
Total Assets	$7,216,282
Total Liabilities	$72,211
Net Assets	$7,144,071

Compensation

Key Employees and Officers	Compensation	Related	Other
Jeff Nathanson (Executive Director)	$162,429	$0	$400
Nancy Glaze (Chair)	$0	$0	$0
Liz Uribe (Vice Chair)	$0	$0	$0
Henry Beaumont (Treasurer)	$0	$0	$0
Estelle Rogers (Secretary)	$0	$0	$0
Noreen Carvolth (Director)	$0	$0	$0
Raissa De La Rosa (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
Jeremy Nichols (Director)	$0	$0	$0
Ernesto Olivares (Director)	$0	$0	$0
Staci Pastis (Director)	$0	$0	$0
Margaret Purser (Director)	$0	$0	$0
David Salm (Director)	$0	$0	$0
Diane Sotos (Director)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Director)	$0	$0	$0
Nancy Wang (Director)	$0	$0	$0

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990

Filed on Oct. 12, 2023

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Fiscal Year Ending Dec.
2021

Revenue

$1,281,403

Expenses

$1,045,925

Net Income

$235,478

Net Assets

$8,214,254

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$942,512	73.6%
Program Services	$24,889	1.9%
Investment Income	$86,438	6.7%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$13,567	1.1%
Net Fundraising	-$612
Sales of Assets	$210,646	16.4%
Net Inventory Sales	$926	0.1%
Other Revenue	$3,037	0.2%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$157,994	15.1%
Professional Fundraising Fees	$0
Other Salaries and Wages	$413,143	39.5%

Assets/Debt
Total Assets	$8,273,943
Total Liabilities	$59,689
Net Assets	$8,214,254

Compensation

Key Employees and Officers	Compensation	Related	Other
Jeff Nathanson (Executive Director)	$157,594	$0	$400
Henry Beaumont (Director)	$0	$0	$0
Raissa De La Rosa (Director)	$0	$0	$0
Nancy Glaze (Chair)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
Jeremy Nichols (Director)	$0	$0	$0
Ernesto Olivares (Director)	$0	$0	$0
Staci Pastis (Treasurer)	$0	$0	$0
Margaret Purser (Director)	$0	$0	$0
Estelle Rogers (Secretary)	$0	$0	$0
David Salm (Director)	$0	$0	$0
Diane Sotos (Director)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Director)	$0	$0	$0
Liz Uribe (Vice Chair)	$0	$0	$0
Noreen Carvolth (Director)	$0	$0	$0
Nancy Wang (Director)	$0	$0	$0
Dale Schmid (Director)	$0	$0	$0

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990

Filed on Nov. 14, 2022

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Fiscal Year Ending Dec.
2020

Revenue

$1,709,150

Expenses

$1,011,192

Net Income

$697,958

Net Assets

$7,820,487

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$1,505,816	88.1%
Program Services	$17,143	1.0%
Investment Income	$80,749	4.7%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$13,546	0.8%
Net Fundraising	-$5,109
Sales of Assets	$94,503	5.5%
Net Inventory Sales	$1,462	0.1%
Other Revenue	$1,040	0.1%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$169,374	16.7%
Professional Fundraising Fees	$0
Other Salaries and Wages	$392,972	38.9%

Assets/Debt
Total Assets	$7,865,726
Total Liabilities	$45,239
Net Assets	$7,820,487

Compensation

Key Employees and Officers	Compensation	Related	Other
Jeff Nathanson (Executive Director)	$161,292	$0	$8,081
Henry Beaumont (Director)	$0	$0	$0
Raissa De La Rosa (Director)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Nancy Glaze (Chair)	$0	$0	$0
Eric Green (Director)	$0	$0	$0
Carin Jacobs (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
Jeremy Nichols (Director)	$0	$0	$0
Ernesto Olivares (Director)	$0	$0	$0
Staci Pastis (Treasurer)	$0	$0	$0
Margaret Purser (Director)	$0	$0	$0
Estelle Rogers (Secretary)	$0	$0	$0
Dale Schmid (Director)	$0	$0	$0
Diane Sotos (Director)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Director)	$0	$0	$0
Liz Uribe (Vice Chair)	$0	$0	$0

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990

Filed on Nov. 2, 2021

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Fiscal Year Ending Dec.
2019

Revenue

$1,103,817

Expenses

$1,173,221

Net Income

-$69,404

Net Assets

$6,973,414

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$879,189	79.6%
Program Services	$47,864	4.3%
Investment Income	$77,326	7.0%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$14,083	1.3%
Net Fundraising	-$15,904
Sales of Assets	$98,980	9.0%
Net Inventory Sales	$1,279	0.1%
Other Revenue	$1,000	0.1%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$185,138	15.8%
Professional Fundraising Fees	$0
Other Salaries and Wages	$414,487	35.3%

Assets/Debt
Total Assets	$7,045,184
Total Liabilities	$71,770
Net Assets	$6,973,414

990

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990-T

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Fiscal Year Ending Dec.
2018

Revenue

$975,888

Expenses

$983,237

Net Income

-$7,349

Net Assets

$6,634,875

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$672,144	68.9%
Program Services	$66,872	6.9%
Investment Income	$99,311	10.2%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$13,418	1.4%
Net Fundraising	-$14,300
Sales of Assets	$125,370	12.8%
Net Inventory Sales	$12,566	1.3%
Other Revenue	$507	0.1%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$150,000	15.3%
Professional Fundraising Fees	$0
Other Salaries and Wages	$336,147	34.2%

Assets/Debt
Total Assets	$6,692,570
Total Liabilities	$57,695
Net Assets	$6,634,875

Compensation

Key Employees and Officers	Compensation	Related	Other
Jeff Nathanson (Executive Director)	$150,000	$0	$0
Henry Beaumont (Director)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Nancy Glaze (Treasurer)	$0	$0	$0
Eric Green (Director)	$0	$0	$0
Carin Jacobs (Director)	$0	$0	$0
Ezbon Jen (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
Jeremy Nichols (Director)	$0	$0	$0
David Noorthoek (Director)	$0	$0	$0
Staci Pastis (Director)	$0	$0	$0
Estelle Rogers (Director)	$0	$0	$0
Sande Schlumberger (Director)	$0	$0	$0
Dale Schmid (Director)	$0	$0	$0
Diane Sotos (Secretary)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Chair)	$0	$0	$0
Liz Uribe (Vice Chair)	$0	$0	$0

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990

Filed on Nov. 14, 2019

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Fiscal Year Ending Dec.
2017

Revenue

$724,073

Expenses

$847,985

Net Income

-$123,912

Net Assets

$7,174,250

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$498,045	68.8%
Program Services	$65,809	9.1%
Investment Income	$77,941	10.8%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$13,595	1.9%
Net Fundraising	-$27,913
Sales of Assets	$88,318	12.2%
Net Inventory Sales	$7,975	1.1%
Other Revenue	$303	0.0%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$142,326	16.8%
Professional Fundraising Fees	$0
Other Salaries and Wages	$219,417	25.9%

Assets/Debt
Total Assets	$7,227,650
Total Liabilities	$53,400
Net Assets	$7,174,250

990

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Fiscal Year Ending Dec.
2016

Revenue

$1,038,598

Expenses

$966,943

Net Income

$71,655

Net Assets

$7,041,292

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$778,032	74.9%
Program Services	$106,884	10.3%
Investment Income	$85,557	8.2%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$13,041	1.3%
Net Fundraising	-$24,557
Sales of Assets	$65,546	6.3%
Net Inventory Sales	$9,133	0.9%
Other Revenue	$4,962	0.5%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$136,047	14.1%
Professional Fundraising Fees	$0
Other Salaries and Wages	$302,792	31.3%

Assets/Debt
Total Assets	$7,128,087
Total Liabilities	$86,795
Net Assets	$7,041,292

Compensation

Key Employees and Officers	Compensation	Related	Other
Diane Evans (Executive Director)	$103,869	$0	$32,178
Henry Beaumont (Director)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Eric Green (Director)	$0	$0	$0
Ezbon Jen (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
David Noorthoek (Director)	$0	$0	$0
Sandra Rubin (Dire Ctor)	$0	$0	$0
Sande Schlumberger (Director)	$0	$0	$0
Dale Schmid (Director)	$0	$0	$0
Nanette Smejkal (Director)	$0	$0	$0
Diane Sotos (Secretary)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Chair)	$0	$0	$0
Liz Uribe (Vice Chair)	$0	$0	$0
Frederic Warnecke (Director)	$0	$0	$0
Jennifer Webley (Director)	$0	$0	$0
Mordechi Winter (Director)	$0	$0	$0

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990

Filed on Nov. 15, 2017

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Fiscal Year Ending Dec.
2015

Revenue

$699,328

Expenses

$1,035,650

Net Income

-$336,322

Net Assets

$6,896,257

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$436,064	62.4%
Program Services	$77,553	11.1%
Investment Income	$67,642	9.7%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$7,901	1.1%
Net Fundraising	$32,613	4.7%
Sales of Assets	$64,163	9.2%
Net Inventory Sales	$11,757	1.7%
Other Revenue	$1,635	0.2%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$113,881	11.0%
Professional Fundraising Fees	$0
Other Salaries and Wages	$283,074	27.3%

Assets/Debt
Total Assets	$6,954,648
Total Liabilities	$58,391
Net Assets	$6,896,257

Compensation

Key Employees and Officers	Compensation	Related	Other
Diane Evans (Executive Director)	$107,944	$0	$5,937
Lindsay Austin (Director)	$0	$0	$0
Henry Beaumont (Chair)	$0	$0	$0
Tim Beglin (Treasurer)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Stephen Graves (Director)	$0	$0	$0
Ezbon Jen (Director)	$0	$0	$0
Chris Mazzia (Director)	$0	$0	$0
David Noorthoek (Director)	$0	$0	$0
Sandra Rubin (Director)	$0	$0	$0
Scott Sacchi (Director)	$0	$0	$0
Sande Schlumberger (Director)	$0	$0	$0
Dale Schmid (Director)	$0	$0	$0
Anya Skrypka (Director)	$0	$0	$0
Diane Sotos (Secretary)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Richard Tempero (Director)	$0	$0	$0
Neva Turner (Director)	$0	$0	$0
Liz Uribe (Director)	$0	$0	$0
Frederic Warnecke (Director)	$0	$0	$0
Jennifer Webley (Director)	$0	$0	$0
Mordechi Winter (Director)	$0	$0	$0

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990

Filed on Nov. 8, 2016

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Fiscal Year Ending Dec.
2014

Revenue

$1,109,830

Expenses

$848,783

Net Income

$261,047

Net Assets

$7,454,838

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$786,604	70.9%
Program Services	$62,310	5.6%
Investment Income	$97,697	8.8%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$9,359	0.8%
Net Fundraising	$0
Sales of Assets	$144,207	13.0%
Net Inventory Sales	$4,540	0.4%
Other Revenue	$5,113	0.5%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$106,373	12.5%
Professional Fundraising Fees	$0
Other Salaries and Wages	$273,690	32.2%

Assets/Debt
Total Assets	$7,663,248
Total Liabilities	$208,410
Net Assets	$7,454,838

Compensation

Key Employees and Officers	Compensation	Related	Other
Diane Evans (Executive Director)	$100,670	$0	$5,703
Chris Mazzia (Secretary)	$0	$0	$0
Henry Beaumont (Chair)	$0	$0	$0
Lindsay Austin (Former Chair)	$0	$0	$0
Shirlee Zane (Director)	$0	$0	$0
Stephen Graves (Director)	$0	$0	$0
Liz Uribe (Director)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Sandy Schlumberger (Director)	$0	$0	$0
Dale Schmid (Treasurer)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Fred Warnecke (Director)	$0	$0	$0
Mordechi Winter (Director)	$0	$0	$0
David Noorthoek (Director)	$0	$0	$0
Terry Sterling (Director)	$0	$0	$0
Nanette Smejkal (Director)	$0	$0	$0
Jennifer Webley (Director)	$0	$0	$0
Lina Hoshino (Director)	$0	$0	$0
Ezbon Jen (Director)	$0	$0	$0
Helen Kwon (Director)	$0	$0	$0
Xavier Nazario (Director)	$0	$0	$0
Sandra Rubin (Director)	$0	$0	$0
Scott Sacchi (Director)	$0	$0	$0
Diane Sotos (Director)	$0	$0	$0
Richard Tempero (Director)	$0	$0	$0
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990

Filed on Nov. 16, 2015

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Fiscal Year Ending Dec.
2013

Revenue

$824,622

Expenses

$716,405

Net Income

$108,217

Net Assets

$7,282,648

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$512,972	62.2%
Program Services	$45,308	5.5%
Investment Income	$75,449	9.1%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$35,866	4.3%
Net Fundraising	$45,854	5.6%
Sales of Assets	$73,909	9.0%
Net Inventory Sales	$3,872	0.5%
Other Revenue	$31,392	3.8%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$104,243	14.6%
Professional Fundraising Fees	$0
Other Salaries and Wages	$237,131	33.1%

Assets/Debt
Total Assets	$7,403,276
Total Liabilities	$120,628
Net Assets	$7,282,648

Compensation

Key Employees and Officers	Compensation	Related	Other
Diane Evans (Executive Director)	$97,971	$0	$6,272
Chris Mazzia (Secretary)	$0	$0	$0
Henry Beaumont (Chair)	$0	$0	$0
Lindsay Austin (Former Chair)	$0	$0	$0
Shirlee Zane (Director)	$0	$0	$0
Deborah Eid (Director)	$0	$0	$0
Stephen Graves (Director)	$0	$0	$0
Liz Uribe (Director)	$0	$0	$0
Don Black (Vice Chair)	$0	$0	$0
Michiko Conklin (Director)	$0	$0	$0
Steven Gelber (Director)	$0	$0	$0
Pat Lenz (Director)	$0	$0	$0
Bob Nugent (Director)	$0	$0	$0
Sandy Schlumberger (Director)	$0	$0	$0
Dale Schmid (Treasurer)	$0	$0	$0
Daphne Smith (Director)	$0	$0	$0
Jack Stuppin (Director)	$0	$0	$0
Fred Warnecke (Director)	$0	$0	$0
Mordechi Winter (Director)	$0	$0	$0
David Noorthoek (Director)	$0	$0	$0
Terry Sterling (Director)	$0	$0	$0
Gertrude Parker (Director)	$0	$0	$0
Nanette Smejkal (Director)	$0	$0	$0
Jennifer Webley (Director)	$0	$0	$0

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990

Filed on Nov. 17, 2014

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Fiscal Year Ending Dec.
2012

Revenue

$1,235,034

Expenses

$752,291

Net Income

$482,743

Net Assets

$7,172,835

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$915,744	74.1%
Program Services	$73,415	5.9%
Investment Income	$73,721	6.0%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$77,532	6.3%
Net Fundraising	$51,165	4.1%
Sales of Assets	$28,361	2.3%
Net Inventory Sales	$11,119	0.9%
Other Revenue	$3,977	0.3%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$99,702	13.3%
Professional Fundraising Fees	$0
Other Salaries and Wages	$234,627	31.2%

Assets/Debt
Total Assets	$7,239,140
Total Liabilities	$66,305
Net Assets	$7,172,835

990

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PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2011

Revenue

$1,132,844

Expenses

$775,585

Net Income

$357,259

Net Assets

$6,766,654

Notable Sources of Revenue		Percent of Total Revenue
Contributions	$873,409	77.1%
Program Services	$46,415	4.1%
Investment Income	$78,525	6.9%
Bond Proceeds	$0
Royalties	$0
Rental Property Income	$74,936	6.6%
Net Fundraising	$33,471	3.0%
Sales of Assets	$17,585	1.6%
Net Inventory Sales	$7,806	0.7%
Other Revenue	$697	0.1%

Notable Expenses		Percent of Total Expenses
Executive Compensation	$100,900	13.0%
Professional Fundraising Fees	$0
Other Salaries and Wages	$266,778	34.4%

Assets/Debt
Total Assets	$6,815,505
Total Liabilities	$48,851
Net Assets	$6,766,654

990

Primary tax return for a nonprofit’s activities, finances, and governance

Primary tax return for a nonprofit’s activities, finances, and governance

PDF

About This Data

What Is This Data?

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains information processed by the IRS during the 2012-2019 calendar years; this generally consists of filings for the 2011-2018 fiscal years, but may include older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

We also link to copies of audits nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year since 2016. These audits are copied from the Federal Audit Clearinghouse.

Which Organizations Are Here?

Every organization that has been recognized as tax exempt by the IRS has to file Form 990 every year, unless they make less than $200,000 in revenue and have less than $500,000 in assets, in which case they have to file form 990-EZ. Organizations making less than $50,000 don’t have to file either form but do have to let the IRS they’re still in business via a Form 990N "e-Postcard."

Nonprofit Explorer has organizations claiming tax exemption in each of the 27 subsections of the 501(c) section of the tax code, and which have filed a Form 990, Form 990EZ or Form 990PF. Taxable trusts and private foundations that are required to file a form 990PF are also included. Small organizations filing a Form 990N "e-Postcard" are not included in this data.

Types of Nonprofits

There are 27 nonprofit designations based on the numbered subsections of section 501(c) of the tax code. See the list »

Get the Data

For those interested in acquiring the original data from the source, here’s where our data comes from:

Raw filing data. Includes EINs and summary financials as structured data.
Exempt Organization profiles. Includes organization names, addresses, etc. You can merge this with the raw filing data using EIN numbers.
Form 990 documents. Prior to 2017, these documents were obtained and processed by Public.Resource.org and ProPublica. Bulk PDF downloads since 2017 are available from the IRS.
Form 990 documents as XML files. Includes complete filing data (financial details, names of officers, tax schedules, etc.) in machine-readable format. Only available for electronically filed documents. Electronic data released prior to October 2021 is also available through Amazon Web Services.
Audits. PDFs of single or program-specific audits for nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year. Available for fiscal year 2015 and later.

API

The data powering this website is available programmatically, via an API. Read the API documentation »

See an issue with the data?

Nonprofit Explorer

Browse millions of annual returns filed by tax-exempt organizations with ProPublica’s Nonprofit Explorer. See details like executive compensation, revenue, expenses and more. Search for an organization or a person, or search the full text of filings.

By Andrea Suozzo, Alec Glassford, Ash Ngu and Brandon Roberts.

Design by Jeff Frankl. Additional development by Ken Schwencke, Mike Tigas, and Sisi Wei.

E-file viewer adapted from IRS e-File Viewer by Ben Getson. Code for scraping audit documents adapated from Govwiki.

Updated September 25, 2025

Museum Of Sonoma County

Organization summary

Type of Nonprofit

Summary charts: organization finances over time

Revenue $1.63M (2023)

Expenses $1.32M (2023)

Total Assets $8.51M (2023)

Total Liabilities $78.8k (2023)

Tax Filings by Year

Fiscal Year Ending Dec. 2023

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

Fiscal Year Ending Dec. 2022

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2021

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2020

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

Fiscal Year Ending Dec. 2019

Extracted Financial Data

Extracted Financial Data from Form 990

Document Links

990

990-T

Fiscal Year Ending Dec. 2018

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2017

Extracted Financial Data

Extracted Financial Data from Form 990

Document Links

990

Fiscal Year Ending Dec. 2016

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2015

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2014

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

990-T

Fiscal Year Ending Dec. 2013

Extracted Financial Data

Extracted Financial Data from Form 990

Compensation

Document Links

990

Revenue

$1.63M (2023)

Expenses

$1.32M (2023)

Total Assets

$8.51M (2023)

Total Liabilities

$78.8k (2023)

Fiscal Year Ending Dec.
2023

Fiscal Year Ending Dec.
2022

Fiscal Year Ending Dec.
2021

Fiscal Year Ending Dec.
2020

Fiscal Year Ending Dec.
2019

Fiscal Year Ending Dec.
2018

Fiscal Year Ending Dec.
2017

Fiscal Year Ending Dec.
2016

Fiscal Year Ending Dec.
2015

Fiscal Year Ending Dec.
2014

Fiscal Year Ending Dec.
2013

Fiscal Year Ending Dec.
2012

Fiscal Year Ending Dec.
2011

Fiscal Year Ending Dec.
2010

Fiscal Year Ending Dec.
2009

Fiscal Year Ending Dec.
2008

Fiscal Year Ending Dec.
2007

Fiscal Year Ending Dec.
2006

Fiscal Year Ending Dec.
2005

Fiscal Year Ending Dec.
2004

Fiscal Year Ending Dec.
2003

Fiscal Year Ending Dec.
2002

Fiscal Year Ending Dec.
2001