The William and Diane Nitterhouse
The William and Diane Nitterhouse is a private foundation based in Chambersburg, Pennsylvania. Its 2025 filing lists three grants totaling $1,225, each designated as a general donation.
The William and Diane Nitterhouse at a glance
In short: The William and Diane Nitterhouse gave $1K across 3 grants in 2025 (avg $408.333), mostly in Pennsylvania. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $1,225
- +11.4% vs 2024
- Grants made (2025)
- 3
- +0.0% vs 2024
- Average grant
- $408
- +11.4% vs 2024
- Median grant
- $500
- Total assets
- $661,304
- +3.8% vs 2024
- Primary geography
- Pennsylvania (90% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026.
How to apply to The William and Diane Nitterhouse
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation states that it makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: PO Box 2013, Chambersburg, PA 17201
Phone: (717) 229-1245
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who The William and Diane Nitterhouse funds
How this funder distributes its grants
Top Recipients
Top 3 recipients in 2025
The largest 2025 recipient was Franklin County Library - Ladies Afternoon Club ($600). Together the top 3 received $1K.
Grant Size Distribution
44 grants across all recorded years
The most common grant size was under $50K: 43 grants of 44 (98%).
Geographic Focus
Where this funder awards grants
In 2025, 90% of grant dollars went to recipients in Pennsylvania and 10% to recipients in Maryland.
Grant Distribution by State
Share of 2025 grant dollars across all 3 itemized grants.
Cities
How The William and Diane Nitterhouse gives
- Giving held roughly steady from 2022 to 2025 (+11%). Method
- In 2025 it paid out 6% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2021 to 2025, annual grant giving ranged from $1K (2022) to $928K (2021). In 2025 it made 3 grants totaling $1K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Franklin County Library - Ladies Afternoon Club Chambersburg, PA | General Donatiojn | $600 |
| New Birth Council of Freedom Dilsburg, PA | General Donation | $500 |
| National Park Foundation Baltimore, MD | General Donation | $125 |
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Financial History
Multi-year comparison from IRS filings
The 2023 filing reported no grants.
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2025 | $661,304 | $32,257 | $7,762 | $1,225 | 3 | $4,441 | $34,024 | $75,358 |
| 2024 | $636,998 | $21,955 | $2,696 | $1,100 | 3 | $1,846 | $36,213 | $60,134 |
| 2023 | $617,805 | $36,177 | $1,582 | — | — | $742 | $33,950 | $53,252 |
| 2022 | $584,104 | $26,625 | $8,795 | $1,100 | 2 | $1,100 | $28,391 | $54,001 |
| 2021 | $566,274 | $525,252 | $931,229 | $927,757 | 36 | — | $521,780 | $64,619 |
Under IRS private-foundation payout rules, The William and Diane Nitterhouse reported a distributable amount of $75K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement or specific funding priorities are stated in the available information. The 2025 grants went to a library club, a council, and a national foundation.
Grantmaking
In 2025, the foundation gave three grants totaling $1,225. Grants ranged from $125 to $600, with a median grant of $500. The largest grants were $600 to Franklin County Library - Ladies Afternoon Club in Chambersburg, Pennsylvania; $500 to New Birth Council of Freedom in Dillsburg, Pennsylvania; and $125 to the National Park Foundation in Baltimore, Maryland.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists William K Nitterhouse, Diane R Nitterhouse, Karen N Diller, and Laura E Martin as trustees.
The William and Diane Nitterhouse's 2025 filing lists 4 officers; none of the 4 officers listed in 2025 report compensation.
Officers on the 2025 filing
Diane R. Nitterhouse
Trustee
On filings since 2021
0.5 hrs/week
No compensation reported
Karen N. Diller
Trustee
On filings since 2021
0.5 hrs/week
No compensation reported
Laura E. Martin
Trustee
On filings since 2021
0.5 hrs/week
No compensation reported
William K. Nitterhouse
Trustee
On filings since 2021
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2021–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about The William and Diane Nitterhouse
How much does The William and Diane Nitterhouse give each year?
The William and Diane Nitterhouse gave $1K across 3 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $1K across 3 grants.
What is The William and Diane Nitterhouse's typical grant size?
The William and Diane Nitterhouse's median grant in 2025 was $500, and its average grant was $408, across 3 grants on its 2025 IRS Form 990-PF.
Where does The William and Diane Nitterhouse give grants?
The William and Diane Nitterhouse gives mostly in Pennsylvania: 90% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was Maryland (10%).
Does The William and Diane Nitterhouse give general operating support?
Yes: 100% of The William and Diane Nitterhouse's 2025 grants with a stated purpose (3 of 3) were for general or operating support, per its 2025 IRS Form 990-PF.
How large is The William and Diane Nitterhouse?
The William and Diane Nitterhouse reported $661K in total assets on its 2025 IRS Form 990-PF. It paid out $4K in qualifying distributions that year, against a required minimum of $75K (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What does The William and Diane Nitterhouse fund?
No mission statement or specific funding priorities are stated in the available information. The 2025 grants went to a library club, a council, and a national foundation. See mission & focus areas ↑
How do I apply for a grant from The William and Diane Nitterhouse?
The foundation states that it makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is The William and Diane Nitterhouse's EIN?
The William and Diane Nitterhouse's EIN (Employer Identification Number) is 23-2493715. IRS Form 990 filing data is available on this page for 2021–2025.
Does The William and Diane Nitterhouse accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2021–2025
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