What is the EIN of CHICAGO ZOOLOGICAL SOCIETY?

The employer identification number (EIN) of CHICAGO ZOOLOGICAL SOCIETY is 36-2167016.

Is CHICAGO ZOOLOGICAL SOCIETY tax-exempt?

Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1941.

Are donations to CHICAGO ZOOLOGICAL SOCIETY tax-deductible?

Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).

When is the next return of CHICAGO ZOOLOGICAL SOCIETY due?

The return for tax year 2026 (the year ending March 31, 2027) is due August 16, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.

When did CHICAGO ZOOLOGICAL SOCIETY last file with the IRS?

The latest return in the IRS public files is the 990 for the year ended March 2026.

Who is the principal officer of CHICAGO ZOOLOGICAL SOCIETY?

The 990 for the year ended March 31, 2026 names Michael J Adkesson.

Who are the officers and directors of CHICAGO ZOOLOGICAL SOCIETY?

The 990 for the year ended March 31, 2026 lists 56 people; 12 received compensation from the organization, the highest $799,468 (Dr Michael Adkesson, President and CEO).

How much revenue does CHICAGO ZOOLOGICAL SOCIETY have?

On its 990 for the year ended March 31, 2026 it reported revenue of $90,541,500, expenses of $85,502,432 and total assets of $329,655,000 at year end.

Nonprofit · EIN 36-2167016

CHICAGO ZOOLOGICAL SOCIETY

Also known as THE NORTHERN TRUST COMPANY

Tax-exempt · BROOKFIELD, IL 60513

Financials

Revenue Expenses · by fiscal year end

Financials of CHICAGO ZOOLOGICAL SOCIETY by year, from its e-filed returns
Year ended	Form	Revenue	Expenses	Net income	Total assets	Liabilities	Net assets
March 31, 2026	990	$90,541,500	$85,502,432	$5,039,068	$329,655,000	$96,426,000	$233,229,000
March 31, 2025	990	$107,989,615	$78,379,597	$29,610,018	$317,202,000	$94,014,000	$223,188,000
March 31, 2024	990	$94,260,071	$75,495,346	$18,764,725	$265,240,000	$70,637,000	$194,603,000

Financial details: 990 for the year ended March 31, 2026

Revenue

Contributions, gifts and grants: $45,300,998
of which government grants: $28,389,305
Program service revenue: $40,107,334
Investment income: $5,663,009
Net rental income: $104,059
Net gain from sales of assets: $2,003,722
Net income from fundraising events: -$649,600
Net income from gaming: $15,700
Other revenue: -$529,841

Expenses

Grants and similar amounts paid: $251,674
Compensation of officers, directors and key employees: $3,289,382
Other salaries and wages: $31,762,306
Salaries, compensation and benefits (total): $44,787,098
Professional fundraising fees: $20,648
Legal fees: $432,863
Accounting fees: $109,678
Occupancy: $2,994,706
Travel: $324,941
Depreciation: $10,137,412
Program services (functional): $69,181,178
Management and general (functional): $12,496,123
Fundraising (functional): $3,825,131

Balance sheet and other

Total assets, start of year: $317,202,000
Total assets, end of year: $329,655,000
Total liabilities, end of year: $96,426,000
Net assets, end of year: $233,229,000
Land, buildings and equipment: $181,167,681
Publicly traded securities: $63,409,000
Net assets without donor restrictions: $174,100,000
Net assets with donor restrictions: $59,129,000
Gross unrelated business income: $163,869
Gross receipts: $109,413,067
Employees: 821
Volunteers: 340
Year formed: 1921
State of legal domicile: IL

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990 for the year ended March 31, 2026, highest compensation first.

Name	Title	Hours / week	Compensation	Other / benefits
Dr Michael Adkesson	President and CEO Trustee or director, Officer	40	$799,468	$104,555
David E Burns	Chief Financial and Admin. Officer Key employee	40	$398,912	$33,544
Cathleen Brueggemann	Sr. VP Development Key employee	40	$331,482	$19,063
Andrea S Rodgers	Sr. VP Guest Experience Operations Key employee	40	$314,886	$20,375
Heather Bilcer	VP Finance Highest-paid employee	40	$266,816	$6,505
Dr Sathya K Chinnadurai	Sr. VP Animal Health Welfare Key employee	40	$223,099	$44,728
Jennifer L Baader	Sr. VP Govt Affairs Key employee	40	$226,836	$31,006
Rita Vondra	Sr. VP Programs Impact Key employee	40	$246,641	$10,226
Shannon Heston	VP Information Tech thru 9/2025 Highest-paid employee	40	$196,859	$33,928
Randall Wells	VP Marine Mammal Conservation Highest-paid employee	40	$199,050	$29,086
Melissa Lewkowich	VP Risk Facilities Mgmt Highest-paid employee	40	$180,859	$30,888
Anthony Ray	VP People Culture thru 9/2025 Highest-paid employee	40	$179,901	$13,029
Cherryl T Thomas	Chair of the Board Trustee or director, Officer	2	$0	$0
William C Kunkler III	Deputy Chair of the Board Trustee or director, Officer	2	$0	$0
Molly Keller	First Vice Chair of the Board Trustee or director, Officer	2	$0	$0

41 more people on this return

Name	Title	Hours / week	Compensation
Stan Pepper	Second Vice Chair of the Board Trustee or director, Officer	2	$0
Elizabeth Hamill Bramsen	Honorary Vice Chair of the Board Trustee or director, Officer	2	$0
Bert A Getz Jr	Honorary Vice Chair of the Board Trustee or director, Officer	2	$0
John P Grube	Past Chair of the Board Trustee or director, Officer	2	$0
Michael P Emmert	Treasurer Trustee or director, Officer	2	$0
Randall G Vickery	Secretary Trustee or director, Officer	2	$0
Stuart B Abelson	Trustee Trustee or director	2	$0
Walter W Becky II	Trustee Trustee or director	2	$0
Jennifer L Bellini	Trustee Trustee or director	2	$0
Jay D Bergman	Trustee Trustee or director	2	$0
Edward McCormick Blair Jr	Trustee Trustee or director	2	$0
Barbara J Bradford	Trustee Trustee or director	2	$0
James A Bryan	Trustee Trustee or director	2	$0
Melissa L Canning as of 62025	Trustee Trustee or director	2	$0
Michael G Canning	Trustee Trustee or director	2	$0
Dr Bonny Chen	Trustee Trustee or director	2	$0
Rita Sola Cook	Trustee Trustee or director	2	$0
JR Davis III	Trustee Trustee or director	2	$0
Gregory J DiDomenico	Trustee Trustee or director	2	$0
Michael Drai	Trustee Trustee or director	2	$0
Sunny Elebua	Trustee Trustee or director	2	$0
Merrick M Elfman	Trustee Trustee or director	2	$0
Dr Lisa C Freeman	Trustee Trustee or director	2	$0
Matthew Gambs	Trustee Trustee or director	2	$0
Sasha L Gerritson	Trustee Trustee or director	2	$0
Darius A Gill	Trustee Trustee or director	2	$0
Barbara Grayson	Trustee Trustee or director	2	$0
Heidi Huizenga	Trustee Trustee or director	2	$0
Kevin M Keeley	Trustee Trustee or director	2	$0
Kevin M Killips	Trustee Trustee or director	2	$0
Barbara Levy Kipper	Trustee Trustee or director	2	$0
Jerry Manne	Trustee Trustee or director	2	$0
Tim Ozinga	Trustee Trustee or director	2	$0
Toni Preckwinkle	Trustee Trustee or director	2	$0
Elizabeth S Quinn	Trustee Trustee or director	2	$0
Benita S Romano	Trustee Trustee or director	2	$0
Kelley C Schueler	Trustee Trustee or director	2	$0
Patrick E Whiteside	Trustee Trustee or director	2	$0
Mark G Sander	Trustee thru 5/25 Trustee or director	2	$0
John A Carpenter	Trustee thru 10/25 Trustee or director	2	$0
Michael F DeSantiago	Trustee thru 3/26 Trustee or director	2	$0

990 for the year ended March 31, 2025: 57 people

Name	Title	Hours / week	Compensation	Other / benefits
Dr Michael Adkesson	President and CEO Trustee or director, Officer	40	$692,858	$104,553
David E Burns	Chief Financial and Admin. Officer Key employee	40	$388,865	$83,409
Cathleen Brueggemann	Sr. VP Development Key employee	40	$317,613	$47,262
Andrea S Rodgers	Sr. VP Guest Experience Operations Key employee	40	$244,810	$32,933
Jennifer L Baader	Sr. VP Govt Affairs Key employee	40	$236,116	$30,995
Dr Sathya K Chinnadurai	Sr. VP Animal Health Welfare Key employee	40	$214,505	$44,515
Sandra L Dornhecker	Sr. VP Human Resources Key employee	40	$225,740	$28,611
Randall Wells	VP Marine Mammal Conservation Highest-paid employee	40	$194,171	$29,015
Shannon Heston	VP Information Technology Highest-paid employee	40	$181,871	$39,066
Melissa Lewkowich	VP Risk Facilities Mgmt Highest-paid employee	40	$186,448	$31,090
Heather Bilcer	VP Finance Highest-paid employee	40	$195,060	$6,240
Jerome E Johnston	VP Guest Services Operations Highest-paid employee	40	$177,475	$10,968
Cherryl T Thomas	Chair of the Board Trustee or director, Officer	2	$0	$0
William C Kunkler III	Deputy Chair of the Board Trustee or director, Officer	2	$0	$0
Elizabeth Hamill Bramsen	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Merrick M Elfman	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Bert A Getz Jr	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
John P Grube	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Molly Keller	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Michael P Emmert	Treasurer Trustee or director, Officer	2	$0	$0
Randall G Vickery	Secretary Trustee or director, Officer	2	$0	$0
Stuart B Abelson	Trustee Trustee or director	2	$0	$0
Walter W Becky II	Trustee Trustee or director	2	$0	$0
Jennifer L Bellini	Trustee Trustee or director	2	$0	$0
Jay D Bergman	Trustee Trustee or director	2	$0	$0
Edward McCormick Blair Jr	Trustee Trustee or director	2	$0	$0
Barbara J Bradford	Trustee Trustee or director	2	$0	$0
James A Bryan	Trustee Trustee or director	2	$0	$0
Michael G Canning	Trustee Trustee or director	2	$0	$0
John A Carpenter	Trustee Trustee or director	2	$0	$0
Dr Bonny Chen	Trustee Trustee or director	2	$0	$0
Rita Sola Cook	Trustee Trustee or director	2	$0	$0
JR Davis III	Trustee Trustee or director	2	$0	$0
Michael F DeSantiago	Trustee Trustee or director	2	$0	$0
Gregory J DiDomenico	Trustee Trustee or director	2	$0	$0
Michael Drai	Trustee Trustee or director	2	$0	$0
Sunny Elebua	Trustee as of 10/24 Trustee or director	2	$0	$0
Dr Lisa C Freeman	Trustee Trustee or director	2	$0	$0
Matthew Gambs	Trustee as of 10/24 Trustee or director	2	$0	$0
Sasha L Gerritson	Trustee Trustee or director	2	$0	$0
Darius A Gill	Trustee Trustee or director	2	$0	$0
Barbara Grayson	Trustee Trustee or director	2	$0	$0
Heidi Huizenga	Trustee Trustee or director	2	$0	$0
Kevin M Keeley	Trustee Trustee or director	2	$0	$0
Kevin M Killips	Trustee Trustee or director	2	$0	$0
Barbara Levy Kipper	Trustee Trustee or director	2	$0	$0
Jerry Manne	Trustee Trustee or director	2	$0	$0
Tim Ozinga	Trustee Trustee or director	2	$0	$0
Stan Pepper	Trustee as of 11/24 Trustee or director	2	$0	$0
Toni Preckwinkle	Trustee Trustee or director	2	$0	$0
Elizabeth S Quinn	Trustee Trustee or director	2	$0	$0
Benita S Romano	Trustee Trustee or director	2	$0	$0
Mark G Sander	Trustee Trustee or director	2	$0	$0
Kelley C Schueler	Trustee Trustee or director	2	$0	$0
Patrick E Whiteside	Trustee Trustee or director	2	$0	$0
Joseph A Gregoire	Trustee thru of 12/24 Trustee or director	2	$0	$0
Stuart D Strahl PhD	Trustee thru of 3/25 Trustee or director	2	$0	$0

990 for the year ended March 31, 2024: 57 people

Name	Title	Hours / week	Compensation	Other / benefits
Dr Michael Adkesson	President and CEO Trustee or director, Officer	40	$682,151	$157,288
David E Burns	Chief Financial and Admin. Officer Key employee	40	$378,747	$35,140
Mary A Cronin	Master Planning Coordinator Highest-paid employee	24	$352,773	$7,654
Cathleen Brueggemann	Sr. VP Development Key employee	40	$313,637	$14,732
Dr Sathya K Chinnadurai	Sr. VP Animal Health Welfare Key employee	40	$207,122	$47,934
Jennifer L Baader	Sr. VP Govt AffairsCommunity Pgms Key employee	40	$205,424	$33,029
Sandra L Dornhecker	Sr. VP Human Resources Key employee	40	$188,377	$30,650
Leah Rippe	VP Marketing Communications Highest-paid employee	40	$193,805	$24,517
Melissa Lewkowich	VP Risk Facilities Mgmt Highest-paid employee	40	$177,504	$33,200
Jerome E Johnston	VP Guest Services Operations Highest-paid employee	40	$183,505	$13,273
Heather Bilcer	VP Finance Highest-paid employee	40	$180,324	$5,943
Cherryl T Thomas	Chair of the Board Trustee or director, Officer	2	$0	$0
William C Kunkler III	Deputy Chair of the Board Trustee or director, Officer	2	$0	$0
John P Grube	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Elizabeth Hamill Bramsen	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Merrick M Elfman	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Bert A Getz Jr	Vice-Chair of the Board Trustee or director, Officer	2	$0	$0
Michael P Emmert	Treasurer Trustee or director, Officer	2	$0	$0
Randall G Vickery	Secretary Trustee or director, Officer	2	$0	$0
Stuart B Abelson	Trustee Trustee or director	2	$0	$0
Walter W Becky II	Trustee Trustee or director	2	$0	$0
Jennifer L Bellini	Trustee Trustee or director	2	$0	$0
Jay D Bergman	Trustee Trustee or director	2	$0	$0
Edward McCormick Blair Jr	Trustee Trustee or director	2	$0	$0
Barbara J Bradford	Trustee Trustee or director	2	$0	$0
James A Bryan	Trustee Trustee or director	2	$0	$0
Michael G Canning	Trustee Trustee or director	2	$0	$0
John A Carpenter	Trustee Trustee or director	2	$0	$0
Dr Bonny Chen	Trustee Trustee or director	2	$0	$0
Rita Sola Cook	Trustee Trustee or director	2	$0	$0
JR Davis III	Trustee Trustee or director	2	$0	$0
Michael F DeSantiago	Trustee Trustee or director	2	$0	$0
Gregory J DiDomenico	Trustee Trustee or director	2	$0	$0
Michael Drai	Trustee as of 9/23 Trustee or director	2	$0	$0
Dr Lisa C Freeman	Trustee Trustee or director	2	$0	$0
Sasha L Gerritson	Trustee Trustee or director	2	$0	$0
Darius A Gill	Trustee Trustee or director	2	$0	$0
Barbara Grayson	Trustee Trustee or director	2	$0	$0
Joseph A Gregoire	Trustee Trustee or director	2	$0	$0
Heidi Huizenga	Trustee Trustee or director	2	$0	$0
Kevin M Keeley	Trustee Trustee or director	2	$0	$0
Molly Keller	Trustee Trustee or director	2	$0	$0
Kevin M Killips	Trustee Trustee or director	2	$0	$0
Barbara Levy Kipper	Trustee Trustee or director	2	$0	$0
Jerry Manne	Trustee Trustee or director	2	$0	$0
Tim Ozinga	Trustee as of 11/23 Trustee or director	2	$0	$0
Toni Preckwinkle	Trustee Trustee or director	2	$0	$0
Elizabeth S Quinn	Trustee as of 4/23 Trustee or director	2	$0	$0
Benita S Romano	Trustee Trustee or director	2	$0	$0
Mark G Sander	Trustee Trustee or director	2	$0	$0
Kelley C Schueler	Trustee Trustee or director	2	$0	$0
Stuart D Strahl PhD	Trustee Trustee or director	2	$0	$0
Patrick E Whiteside	Trustee Trustee or director	2	$0	$0
Amy Best	Trustee 11/23-3/24 Trustee or director	2	$0	$0
Veronica Gomez	Trustee thru 11/23 Trustee or director	2	$0	$0
Kathryn Babcock Shaffer	Vice Chair thru 12/23 Trustee or director, Officer	2	$0	$0
Kristi Weaver	Trustee thru 12/23 Trustee or director	2	$0	$0

Address and contacts

Address (IRS master file): 3300 GOLF RD, BROOKFIELD, IL 60513-1060
In care of: % H BARNUM
Principal officer (990 for 2025): Michael J Adkesson, 3300 Golf Road, Brookfield, IL 60513
Signed the 990: Michael J Adkesson, President and CEO
Phone: (708) 688-8300
Website: www.brookfieldzoo.org
Return prepared by: Plante Moran PLLC

Mission

To inspire conservation leadership by connecting people with wildlife and nature.
990 for the year ended March 31, 2026

Program accomplishments

Park Operations The CZS maintains 76 buildings on 235 acres of land to exhibit over 2,500 animals. In a typical year, two million visitors annually enjoy the experience of seeing and learning about the animals of the world. Each individual that enters through Brookfield Zoos gates represents an opportunity to introduce representatives of the wild world, to convey our intertwined connections to the animal kingdom, and to encourage positive change in the world. The Zoo is open almost every day of the year. Admission is free to the general public 52 days/year and at all times to Illinois school groups and military personnel. The membership team services our 100,000 member households, providing them with the opportunity to participate in the conservation and educational efforts of CZS. The events team provides seasonal and animal themed events such as Earth Day, Spring Fest, Lantern Festival, Holiday Magic and Boo at the Zoo. Visitor services provides narrated tram tours and accessible transportation options in the park.
Expenses $30,984,178 · revenue $28,140,916
Animal Health, Welfare, Care and Programs More than 2500 ambassadors of the animal kingdom provide our visitors with a rare opportunity to see species from around the globe and experience up close, personal encounters. CZS staff provide expert care of these ambassadors, where innovations in husbandry techniques and pioneering breeding programs are part of the cuttting edge culture of excellence and integrating disciplines such as population biology, behavioral science, nutrition and veterinary science help determine the best ways to provide and continuously care for the animals. CZS also incorporates models and practices from an array of animal care professionals around the world, to develop the best possible zoo-based animal care and management practices. Through Keeper Chats and Ambassador Animal Encounters, staff share their knowledge of the animals in their care with zoo guests, helping them gain an appreciation for all citizens of the natural world. Through field programs,CZS support efforts to protect and restore populations of threatened species in other parts of the world.
Expenses $34,094,000 · grants $197,674 · revenue $3,194,219
Education and Community Engagement Through its education programs, CZS communicates with others to engender in them a sense of ownership about living harmoniously with nature and helping save endangered species. Education specialists, volunteers, curators, graphic and exhibit designers, photographers and many others contribute to sharing this information both in person and virtually. As well as reaching the daily visitors to the Zoo, CZSs education and outreach programming reaches out to would be conservationists outside of the Zoo including classrooms of school children and teachers, local libraries and community organizations to engage them in nature based programs, strengthening the bridge between education and conservation and working together to create healthy spaces for people and wildlife.
Expenses $4,103,000 · grants $54,000 · revenue $298,892

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in March, so each return is due on the 15th day of the 5th month after that.

Tax year	Year ended	Due	IRS public records
2025	March 31, 2026	August 17, 2026	990 on file
2024	March 31, 2025	August 15, 2025	990 on file
2023	March 31, 2024	August 15, 2024	990 on file

IRS record

EIN: 36-2167016
Tax-exempt status: 501(c)(3): Charitable, religious, educational or scientific organization
Foundation status: Publicly supported organization (170(b)(1)(A)(vi))
Donations deductible (Pub 78): Public charity, 50% deduction limit
Exempt since: 1941
Accounting year ends: March
Files: Form 990 or 990-EZ
Category (NTEE): Animal-related (D500)
Assets (IRS master file): $329,655,000
Income (IRS master file): $109,413,067

Filing history

Form	Year ended	Revenue	Expenses	Assets	Return
990	March 2026	$90,541,500	$85,502,432	$329,655,000	XML
990-T	March 2026	–	–	–	IRS
990	March 2025	$107,989,615	$78,379,597	$317,202,000	XML
990-T	March 2025	–	–	–	IRS
990	March 2024	$94,260,071	$75,495,346	$265,240,000	XML
990-T	March 2024	–	–	–	IRS
990	March 2023	$64,594,406	$66,115,083	$226,030,000	IRS
990-T	March 2023	–	–	–	IRS
990	March 2022	–	–	–	IRS
990-T	March 2022	–	–	–	IRS
990	December 2020	–	–	–	IRS
990-T	December 2020	–	–	–	IRS
990	December 2019	–	–	–	IRS
990	December 2018	–	–	–	IRS

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 36-2167016).

Questions about CHICAGO ZOOLOGICAL SOCIETY

What is the EIN of CHICAGO ZOOLOGICAL SOCIETY?: The employer identification number (EIN) of CHICAGO ZOOLOGICAL SOCIETY is 36-2167016.
Is CHICAGO ZOOLOGICAL SOCIETY tax-exempt?: Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1941.
Are donations to CHICAGO ZOOLOGICAL SOCIETY tax-deductible?: Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does CHICAGO ZOOLOGICAL SOCIETY file?: Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of CHICAGO ZOOLOGICAL SOCIETY due?: The return for tax year 2026 (the year ending March 31, 2027) is due August 16, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did CHICAGO ZOOLOGICAL SOCIETY last file with the IRS?: The latest return in the IRS public files is the 990 for the year ended March 2026.
Who is the principal officer of CHICAGO ZOOLOGICAL SOCIETY?: The 990 for the year ended March 31, 2026 names Michael J Adkesson.
Who are the officers and directors of CHICAGO ZOOLOGICAL SOCIETY?: The 990 for the year ended March 31, 2026 lists 56 people; 12 received compensation from the organization, the highest $799,468 (Dr Michael Adkesson, President and CEO).
How much revenue does CHICAGO ZOOLOGICAL SOCIETY have?: On its 990 for the year ended March 31, 2026 it reported revenue of $90,541,500, expenses of $85,502,432 and total assets of $329,655,000 at year end.

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