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The William and Diane Nitterhouse Foundation at a glance

· Private foundation

The William and Diane Nitterhouse Foundation

Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$1k
Granted FY2025still arriving
3
Grants FY2025still arriving
2
States reached
$600
Largest
01What it fundsRead
02The needRead
03Its fieldRead
04Through PlinthRead
01What it funds
0198% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2021 to 2025.

Human Services$909kEducation$8kArts & Culture$4kHealth$3kFood & Nutrition$1kCivil Rights$1kPublic Benefit$900Environment$825Other$0
02FY2025 · 3 grants

Where the money goes

Grants by size, and the largest recipients.

$500
Median grant
2
States reached
$661k
Total assets
Largest grants
RecipientAmount
FRANKLIN COUNTY LIBRARY - LADIES AFTERNOON CLUB$600
NEW BIRTH COUNCIL OF FREEDOM$500
NATIONAL PARK FOUNDATION$125
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Its human-services grants (FY21–22, $2k) land where the poverty rate runs at 9%, against an area that typically sits at 9%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 9%Monarchs Way: $1k → 9%Noahs House: $500 → 9%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.

Which US states its grants reach

NH
PA
WV
VA
MD
KS
TN
DC
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its field

Closest unfunded matches

The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.

1
American Association for the Advancement of Science

Advance science, engineering, and innovation throughout the world for the benefit of all. the world's largest multidisciplinary scientific society and a leading publisher of cutting-edge research through its science family of journals,…

Science & Tech
2
United States Naval Institute

Provide an independent forum for those who dare to read, think, speak, and write to advance the professional, literary, and scientific understanding of sea power and other issues critical to global security.

—
3
Eastern National

Eastern national promotes the public's understanding and support of america's national parks and other public trust partners by providing quality educational experiences, products and services.

Recreation & Sports
4
Npr Foundation

The npr foundation ("foundation") is organized and operated exclusively for the benefit of its sole supported organization, national public radio, inc. ("npr inc."). the foundation supports npr inc. through various activities such as…

—
5
American Gas Association

American gas association's (the association) mission is to develop and advocate for informed, innovative, and durable policy that fulfills our nation's energy needs, environmental aspirations and economic potential. we are committed to…

—
6
National Fish and Wildlife Foundation

To sustain, restore, and enhance the nation's fish, wildlife, plants, and habitats.

Animals
7
Western Pennsylvania Conservancy

The western pennsylvania conservancy protects and restores exceptional places to provide our region with clean waters and healthy forests, wildlife and natural areas for the benefit of present and future generations. the conservancy…

Environment
8
American Astronomical Society

The american astronomical society (aas), established in 1899, is the major organization of professional astronomers in north america. the basic objective of the aas is to promote the advancement of astronomy and closely related branches of…

Science & Tech
9
Jefferson National Parks Association

Jefferson national parks association provides quality educational products and related services that enhance public understanding and appreciation of america's national parks, public lands and historic places.

Arts & Culture
10
National Committee for Quality Assurance

Our mission: to improve the quality of health care.our vision: better health care. better choices. better health.

Health
11
Greater Philadelphia Tourism Marketing Corporation

Visit philadelphia is our name and our mission. as the region's official tourism marketing agency, we build greater philadelphia's image, drive visitation and boost the economy.

Community Improvement
12
American Civil Liberties Union Fund of the District of Columbia

Preservation of civil liberties through litigation and public education.

—
How this is measured
The grantee most central to the portfolio’s shape is The Heritage Foundation; the most unlike its peers is At the Cross Ministries. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
04the grantee network

27 grantees tracked through their own filings, 2017–2025.

Each grant beside the grantee’s revenue from every source, year by year.

How this is measured

Counted here: distinct organizations funded across 2017 to 2025, not grant rows in a single year, so this will not match the grant count on the cover. 27 of the 43 grantees resolved in that span have returns of their own we could reconcile.

Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.

0
Load-bearing (≥25% of a budget)
1
Early backer (in before they grew)
27/27
Grantees still filing
17/27
Grew since first funded

Where the money sits, by cause and then by grantee

The William K Nitterhouse Family Fu: $906,593 · OtherThe William K Nitterhouse Family Fu+26 more: $9,389 · OtherSHIPPENSBURG UNIVERSITY FOUNDATION: $4,500 · EducationGREENCASTLE-ANTRIM EDUCATION FOUNDATION: $2,000 · EducationWILSON COLLEGE: $500 · Education+1 more: $200 · EducationPENNON ORGANIZATION: $1,500 · Arts & CultureALLISON-ANTRIM MUSEUM INC: $500 · Arts & CultureFORT LOUDON HISTORICAL SOCIETY INC: $500 · Arts & CultureTHOMAS JEFFERSON FOUNDATION INC: $250 · Arts & CultureNational Foundation For Cancer Research: $1,000 · HealthAMERICAN CANCER SOCIETY INC: $500 · HealthST JUDE CHILDREN'S RESEARCH HOSPITAL INC: $500 · HealthAt the Cross Ministries: $1,000 · Human ServicesNOAHS HOUSE INC: $500 · Human ServicesB O P I C INC: $1,000 · Food & NutritionTHE HERITAGE FOUNDATION: $500 · Public BenefitJUDICIAL WATCH INC: $250 · Public Benefit
Other$915,982Education$7,200Arts & Culture$2,750Health$2,000Human Services$1,500Food & Nutrition$1,000Public Benefit$750

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetSHIPPENSBURG UNIVERSITY FOUNDATION: $4,500 over 1y, 0.0% of budgetGREENCASTLE-ANTRIM EDUCATION FOUNDATION: $2,000 over 1y, 0.5% of budgetPENNON ORGANIZATION: $1,500 over 1y, 0.0% of budgetB O P I C INC: $1,000 over 1y, 0.8% of budgetAt the Cross Ministries: $1,000 over 1y, 0.2% of budgetNational Foundation For Cancer Research: $1,000 over 1y, 0.0% of budgetNEW FRANKLIN VOLUNTEER FIRE COMPANY: $500 over 1y, 0.1% of budgetAPPALACHIAN TRAIL CONSERVANCY: $500 over 1y, 0.0% of budgetNOAHS HOUSE INC: $500 over 1y, 0.1% of budgetWILSON COLLEGE: $500 over 1y, 0.0% of budgetAMERICAN CANCER SOCIETY INC: $500 over 1y, 0.0% of budgetALLISON-ANTRIM MUSEUM INC: $500 over 1y, 0.3% of budgetST JUDE CHILDREN'S RESEARCH HOSPITAL INC: $500 over 1y, 0.0% of budgetFORT LOUDON HISTORICAL SOCIETY INC: $500 over 1y, 0.4% of budgetTHE HERITAGE FOUNDATION: $500 over 1y, 0.0% of budgetTHE BOYS AND GIRLS CLUB OF CHAMBERSBURG AND SHIPPENSBURG INC: $300 over 1y, 0.1% of budgetTHOMAS JEFFERSON FOUNDATION INC: $250 over 1y, 0.0% of budgetSPECIAL OLYMPICS PENNSYLVANIA INC: $250 over 1y, 0.0% of budgetJUDICIAL WATCH INC: $250 over 1y, 0.0% of budgetFAYETTEVILLE VOLUNTEER FIRE DEPARTMENT: $250 over 1y, 0.0% of budgetSHALOM CHRISTIAN ACADEMY ASSOCIATION: $200 over 1y, 0.0% of budgetNATIONAL PARK FOUNDATION: $125 over 1y, 0.0% of budgetWORLD WILDLIFE FUND INC: $100 over 1y, 0.0% of budgetYoung America's Foundation: $100 over 1y, 0.0% of budgetTHE NATURE CONSERVANCY: $100 over 1y, 0.0% of budgetOCCUPATIONAL SERVICES INC: $64 over 1y, 0.0% of budget
Grantee by grantee: a decade per organization, before and after funding

A decade per grantee: revenue shaded, grants as bars, all rows on one timeline.

Co-funders

Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.

Chambersburg HospitalThe Foundation for En…McCleary Family Found…Stewart Alexander Md …Vanguard Charitable E…The Bank of America C…American Online Givin…Donor Advised Charita…Fidelity Investments …Amazonsmile Foundation
Chambersburg HospitalPA17.9× affinity6 shared granteesties to 9 of 9Hover any node to trace its alignments.Compare side by side →

Open a dossier: Chambersburg Hospital · The Foundation for Enhancing Communities · McCleary Family Foundation · Stewart Alexander Md Fdn Tr Udeed · Vanguard Charitable Endowment Program · The Bank of America Charitable Foundation Inc · American Online Giving Foundation Inc · Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile Foundation

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization The William and Diane Nitterhouse Foundation funds: left to right is the share of its income from government, bottom to top the share from The William and Diane Nitterhouse Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 10%0%1%3%5%funder's share of their income ↑0%25%50%75%100%share of the org’s income from government →
    no gov moneyreceives it· size = income
    1get no government money at all
    7report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    typical government reliance, FY20–25
    How this is measured
    Government income is each org’s traced federal awards (USASpending grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that a grant caused the public funding. Coverage is precision-first, a floor rather than a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12 to 24 months.
    04Through Plinth

    Warm introductions · Powered by PlinthPlus

    How do I get to The William and Diane Nitterhouse Foundation?

    Find your warmest path to The William and Diane Nitterhouse Foundation through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.

    Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.

    On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 43 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

    How this is measured
    Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

    Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

    Source object · view filing

    Play a game based on William and Diane Nitterhouse’s filings →

    More from the funding graph

    The unnamed billions
    grants reported with no recipient in the public record
    The regranting layer
    51% of grant dollars land in the regranting layer
    The DAF merry-go-round
    $9.7B circulates between donor-advised funds
    The endowment market
    who holds foundation money, and what just moved
    The camps
    funders cluster by geography, not ideology
    By state
    where grant money is based, and what stays home