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EIN36-1505770

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Morton Arboretum

Updated October 30, 2026. Based on Internal Revenue Service records. Published by Humblebee.

Exempt under
501(c)(3)[1]
IRS ruling date
June 1925[2]
Publication 78 data
Listed (PC)[3]
Total revenue, period ending Dec 2024
$57,793,716[4]

Morton Arboretum is listed in IRS records in LISLE, Illinois, as exempt under section 501(c)(3)[5][1]. The IRS master file lists total revenue of $57,793,716 for the tax period ending December 2024[4].

IRS status

The IRS lists Morton Arboretum as exempt under section 501(c)(3), classification: Charitable Organization[1]. Its foundation code is 15: Organization that receives a substantial part of its support from a governmental unit or the general public 170(b)(1)(A)(vi)[6]. It appears in Publication 78 data with status code PC, a public charity with deductibility limitation 50% (60% for cash contributions)[3]. The IRS classifies it under NTEE code C410: Environment, Botanical Gardens, Arboreta and Botanical Organizations[7].

Item IRS record
EIN[5] 36-1505770
Location in IRS records[5] LISLE, Illinois
Exempt under[1] Section 501(c)(3)
IRS classification[1] Charitable Organization
Ruling date[2] June 1925
Foundation code[6] 15: Organization that receives a substantial part of its support from a governmental unit or the general public 170(b)(1)(A)(vi)
Deductibility code[8] 1: Contributions are deductible
Publication 78 data[3] Listed, status PC
NTEE code[7] C410: Environment, Botanical Gardens, Arboreta and Botanical Organizations
Filing requirement[9] 990 (all other) or 990EZ return
Fiscal year ends[10] December
Latest e-filed return[11] Form 990, tax period ending December 2024

Finances as reported to the IRS

On its Form 990 for the tax period ending December 2023, Morton Arboretum reported total revenue of $45,149,282[12]. This included contributions, gifts and grants of $18,150,596 and program service revenue of $10,675,996[13]. It reported total expenses of $52,201,196 and net assets of $297,536,894 for that period[12]. Total revenue on its Form 990 was $64,971,405 for the tax period ending December 2021[14] and $53,650,331 for December 2022[15]. The December 2023 figure is lower than both.

IRS master file, newer period. For the most recent return in the IRS master file, for the tax period ending December 2024, the IRS lists total revenue of $57,793,716 and total assets of $367,601,821.[4]

December 2021: total revenue $65.0M$65.0MDecember 2021: total expenses $40.9M$40.9MDec 2021December 2022: total revenue $53.7M$53.7MDecember 2022: total expenses $47.8M$47.8MDec 2022December 2023: total revenue $45.1M$45.1MDecember 2023: total expenses $52.2M$52.2MDec 2023
  • Total revenue
  • Total expenses
Amounts as reported on each return, rounded in the chart. Exact figures are in the table below[12].
Tax period ending Form Total revenue Total expenses Net assets at year end
December 2021[14]Form 990$64,971,405$40,941,761$316,483,560
December 2022[15]Form 990$53,650,331$47,787,763$280,785,934
December 2023[12]Form 990$45,149,282$52,201,196$297,536,894

Totals as reported on each return. The IRS publishes these extracts one to two years after filing.

Balance sheet, tax period ending December 2023

Line Amount
Total assets[16] $354,910,949
Total liabilities[16] $57,374,055
Net assets or fund balances[16] $297,536,894

Employees. Morton Arboretum reported 564 employees on Form W-3 for calendar year ending with or within the tax period ending December 2023 (Form 990, Part V, line 2a).[17]

Compensation over $100,000. On the Form 990 for the tax period ending December 2023, Morton Arboretum reported 28 individuals who received more than $100,000 of reportable compensation from the organization (Part VII, line 2).[18]

Form 990 checklist. In the Form 990 checklist (Part IV) for the tax period ending December 2023, Morton Arboretum answered yes to: it engaged in lobbying activities; it reported professional fundraising services.[19]

Questions people ask

What is the EIN of Morton Arboretum?
The IRS lists Morton Arboretum with EIN 36-1505770[5].
Is Morton Arboretum a 501(c)(3) nonprofit?
The IRS lists it as exempt under section 501(c)(3), classification: Charitable Organization[1].
Are contributions to Morton Arboretum tax-deductible?
IRS deductibility code 1 reads: Contributions are deductible[8]. It appears in Publication 78 data with status code PC[3].
Where is Morton Arboretum located?
The IRS master file lists it in LISLE, Illinois[5].
What revenue did Morton Arboretum report?
On its Form 990 for the tax period ending December 2023, it reported total revenue of $45,149,282[12].

Facts and sources

  1. The IRS lists Morton Arboretum as exempt under section 501(c)(3) of the Internal Revenue Code, classification: Charitable Organization. IRS EO Business Master File
  2. The ruling date in the IRS master file (the month and year of the IRS letter recognizing the exemption) is June 1925. IRS EO Business Master File
  3. Morton Arboretum (EIN 36-1505770) appears in the IRS Publication 78 data, the list of organizations eligible to receive tax-deductible charitable contributions, with status code PC (A public charity, deductibility limitation 50% (60% for cash contributions)). IRS Tax Exempt Organization Search data
  4. For the most recent return in the IRS master file, for the tax period ending December 2024, the IRS lists total revenue of $57,793,716 and total assets of $367,601,821. IRS EO Business Master File
  5. The IRS Exempt Organizations Business Master File lists Morton Arboretum with employer identification number (EIN) 36-1505770, located in LISLE, Illinois. IRS EO Business Master File
  6. IRS foundation code 15 for Morton Arboretum: Organization that receives a substantial part of its support from a governmental unit or the general public 170(b)(1)(A)(vi). IRS EO Business Master File
  7. The IRS master file assigns Morton Arboretum the National Taxonomy of Exempt Entities (NTEE) code C410: Environment, Botanical Gardens, Arboreta and Botanical Organizations. IRS EO Business Master File
  8. IRS deductibility code 1 for Morton Arboretum: Contributions are deductible. IRS EO Business Master File
  9. IRS filing requirement code 01 for Morton Arboretum: 990 (all other) or 990EZ return. IRS EO Business Master File
  10. Morton Arboretum's accounting period (fiscal year) ends in December, according to the IRS master file. IRS EO Business Master File
  11. The IRS Form 990 series e-file data released in 2025 includes a Form 990 from Morton Arboretum for the tax period ending December 2024. IRS Form 990 e-file data
  12. On its Form 990 for the tax period ending December 2023, Morton Arboretum reported total revenue $45,149,282, total expenses $52,201,196, net assets or fund balances at year end $297,536,894. IRS SOI Form 990 extracts
  13. Revenue lines on the Form 990 for the tax period ending December 2023: contributions, gifts and grants $18,150,596 (Part VIII, line 1h); program service revenue $10,675,996 (Part VIII, line 2g); investment income $3,763,279 (Part VIII, line 3); total revenue $45,149,282 (Part VIII, line 12). IRS SOI Form 990 extracts
  14. On its Form 990 for the tax period ending December 2021, Morton Arboretum reported total revenue $64,971,405, total expenses $40,941,761, net assets or fund balances at year end $316,483,560. IRS SOI Form 990 extracts
  15. On its Form 990 for the tax period ending December 2022, Morton Arboretum reported total revenue $53,650,331, total expenses $47,787,763, net assets or fund balances at year end $280,785,934. IRS SOI Form 990 extracts
  16. Balance sheet at the end of the tax period ending December 2023 (Form 990, Part X): total assets $354,910,949, total liabilities $57,374,055, net assets or fund balances $297,536,894. IRS SOI Form 990 extracts
  17. Morton Arboretum reported 564 employees on Form W-3 for calendar year ending with or within the tax period ending December 2023 (Form 990, Part V, line 2a). IRS SOI Form 990 extracts
  18. On the Form 990 for the tax period ending December 2023, Morton Arboretum reported 28 individuals who received more than $100,000 of reportable compensation from the organization (Part VII, line 2). IRS SOI Form 990 extracts
  19. In the Form 990 checklist (Part IV) for the tax period ending December 2023, Morton Arboretum answered yes to: it engaged in lobbying activities; it reported professional fundraising services. IRS SOI Form 990 extracts

All figures are as the organization reported them to the IRS for the stated tax period. Say the tax period with every figure. Finance figures come from the IRS SOI annual extracts, which lag filing by one to two years. The IRS master file can list a newer period: keep the two apart and name each period. To see an organization's own filings, use the IRS Tax Exempt Organization Search.