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DAYTON SOCIETY OF NATURAL HISTORY DAYTON MUSEUM OF NATURAL HISTORY

EIN 31-0585917 DAYTON, OH

Revenue 2024
$7,773,993
Expenses 2024
$5,013,607

Program services were 69.3% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
A56Z
Classification
2000
Street
2600 DEWEESE PKWY

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • MICHAEL WESTENDORF

    CFO

    Total calculated
    $124,617
    From this org
    $114,450
    From related orgs
    $0
    Other
    $10,167
    Hours/week
    40

  • TRACEY TOMME

    PRESIDENT & CEO

    Total calculated
    $201,969
    From this org
    $197,472
    From related orgs
    $0
    Other
    $4,497
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $180,312
    Bonus
    $17,160
    Other
    $0
    Deferred
    $3,981
    Nontaxable benefits
    $516
    Filer's total
    $201,969

  • JASON TRIMBACH

    CHAIR

    Total calculated
    $0
    Hours/week
    2

  • STEVE HESS

    VICE CHAIR

    Total calculated
    $0
    Hours/week
    2

  • GREGORY HOFFBAUER

    TREASURER

    Total calculated
    $0
    Hours/week
    2

  • CARISSA ROSS

    SECRETARY

    Total calculated
    $0
    Hours/week
    2

  • SCOTT BALLARD

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • JOHN BERAN

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • ADAMA DIAKHATE

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • CHERYL ENNIS

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • SHAWN FARRELL

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • DIANA FEATHERSTONE

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • ERIN HOLDEN

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • CHRISTOPHER JAMES

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • GLEN MCMURRY

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • JEFFREY MILLER

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • KAILEY NOLAN

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • YASMEEN SOIN

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • MIA SPELLS

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • NORA STANG

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • MICHAEL STEMEN

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • JEFFREY TRZECIAK

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

  • RALPH WILCOXSON II

    TRUSTEE

    Total calculated
    $0
    Hours/week
    2

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead — compensation, contributions to benefit plans, and expense account — and the total sums those. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $7,773,993
    Expenses
    $5,013,607
    Contributions
    $4,685,647
    Grants paid
    $0
  • 2023
    Revenue
    $6,521,051
    Expenses
    $4,925,439
    Contributions
    $3,325,925
    Grants paid
    $0
  • 2022
    Revenue
    $5,113,992
    Expenses
    $4,412,377
    Contributions
    $2,716,484
    Grants paid
    $0

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2024 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2023 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2022 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

Nonprofiteer parses the Form 990 only. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

The 10 largest by cash amount. The API serves every itemized grant.

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 10 September 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.