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Company lists · Data refreshed September 2026

Top 25 Consulting for nonprofit organizations based in Washington, United States

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 381 companies tracked

RevenueBase identified 381 consulting for nonprofit organizations headquartered in Washington, United States as of September 2026 and tracks 3,684 professional contacts across them, including 1,659 with verified work emails. New York is the largest hub.

This list covers consulting for nonprofit organizations headquartered in Washington, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review
381Companies
3,684Contacts tracked
1,659Verified emails
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The 25 largest consulting for nonprofit organizations based in Washington, United States

Ranked by team size
Top 25 of 381 consulting for nonprofit organizations based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to consulting for nonprofit organizations: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1
Nonprofit Hr, Powered By Onedigital
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202610001+300 contacts →

Partial evidence

“Nonprofit HR was founded with one goal in mind: to strengthen the social impact sector by strengthening its people.”

Source: RevenueBase Database · checked Sep 21, 2026
2
Arabella Advisors
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 2026201-500227 contacts →

Partial evidence

“Arabella Advisors is a professional services firm that provides administrative, operational, and strategic support to nonprofits, foundations, and individual donors.”

Source: RevenueBase Database · checked Sep 21, 2026
3
M R
Indirect evidenceWashington, United StatesHQ checked Sep 21, 202651-200208 contacts →

Indirect evidence

“We are M+R.”

Source: RevenueBase Database · checked Sep 21, 2026
4
Mcallister & Quinn
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-200170 contacts →

Partial evidence

“McAllister & Quinn is a Washington, DC consulting firm that provides a comprehensive range of services to a diverse group of clients with issues before the federal government.”

Source: RevenueBase Database · checked Sep 21, 2026
5
Global Impact
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-200170 contacts →

Partial evidence

“Global Impact serves as a trusted philanthropy advisor, intermediary, and nonprofit partner for greater giving.”

Source: RevenueBase Database · checked Sep 21, 2026
6
Herren Associates
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-200142 contacts →

Indirect evidence

“Here at Herren, our goals are to drive efficiency and maximize the value of every dollar our clients spend.”

Source: RevenueBase Database · checked Sep 21, 2026
7
Hilltop Consultants
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-50101 contacts →

Partial evidence

“Hilltop Consultants is a consulting organization entirely run by Georgetown University undergraduates that executes and leads 6-7 strategy consulting projects each semester for…”

Source: RevenueBase Database · checked Sep 21, 2026
8
ORR Group
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20099 contacts →

Indirect evidence

“Orr Group was born out of a need for event management and fundraising support in the philanthropic sector.”

Source: RevenueBase Database · checked Sep 21, 2026
9
Raffa, PC
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 20261,001-5,00087 contacts →

Indirect evidence

“Top accounting firm Raffa, P.C.”

Source: RevenueBase Database · checked Sep 21, 2026
10
Humentum
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20081 contacts →

Partial evidence

“Humentum is a global nonprofit that unlocks the strategic power of operating models for social good organizations.”

Source: RevenueBase Database · checked Sep 21, 2026
11
Avalon Consulting Group
Strong evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20074 contacts →

Strong evidence

“Avalon is a full-service fundraising consulting agency helping nonprofits realize the full potential of their direct marketing programs through multi-channel fundraising…”

Source: RevenueBase Database · checked Sep 21, 2026
12
Georgetown Global Consulting
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20070 contacts →

Partial evidence

“Most consulting firms specialize in consulting for either for-profit companies or large multinational non-profits or NGOs.”

Source: RevenueBase Database · checked Sep 21, 2026
13
Lautman Maska Neill & Company
Strong evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20064 contacts →

Strong evidence

“Lautman Maska Neill & Company is an award-winning direct response consulting firm specializing in fully-integrated fundraising exclusively for nonprofits.”

Source: RevenueBase Database · checked Sep 21, 2026
14
Freedman Consulting, LLC
Strong evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-5061 contacts →

Strong evidence

“Freedman Consulting, LLC, a mission-driven firm, offers strategic consulting services to foundations, nonprofit organizations, and public interest coalitions, advising many of the…”

Source: RevenueBase Database · checked Sep 21, 2026
15
Strategix Management LLC
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 2026201-50059 contacts →

Indirect evidence

“Founded in 2016 by President and CEO, Jonathan Crawley, Strategix Management LLC employs cutting-edge technology to streamline and ignite program activities that increase the…”

Source: RevenueBase Database · checked Sep 21, 2026
16
Elevate Smart Grants For Powerful Social Change
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20055 contacts →

Partial evidence

“Elevate is a woman-owned and woman-led business established to help nonprofit organizations of all sizes build, sustain, and grow effective grant programs.”

Source: RevenueBase Database · checked Sep 21, 2026
17
Boardsource
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-5053 contacts →

Partial evidence

“BoardSource envisions a future where the nonprofit community has the leadership to fulfill its purpose and create a just world where all can thrive.”

Source: RevenueBase Database · checked Sep 21, 2026
18
Ward Circle Strategies
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20052 contacts →

Indirect evidence

“Ward Circle Strategies, Inc.”

Source: RevenueBase Database · checked Sep 21, 2026
19
HAN Group LLC
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20051 contacts →

Partial evidence

“Han Group is a public accounting firm committed to serving the nonprofit community by providing unparalleled expertise in nonprofit Audits & Assurance, Managed Accounting, Tax…”

Source: RevenueBase Database · checked Sep 21, 2026
20
Community IT Innovators
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20046 contacts →

Indirect evidence

“Community IT Innovators is a Washington, D.C.”

Source: RevenueBase Database · checked Sep 21, 2026
21
Frontline Solutions
Strong evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-5046 contacts →

Strong evidence

“We are a diverse, Black-owned consulting firm that serves the philanthropic and nonprofit sectors.”

Source: RevenueBase Database · checked Sep 21, 2026
22
Capital Group
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-5043 contacts →

Partial evidence

“Capital Group is a management consulting firm with more than a decade of experience in providing effective and innovative consulting services to public and private sector clients.”

Source: RevenueBase Database · checked Sep 21, 2026
23
Idealist Consulting
Strong evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20038 contacts →

Strong evidence

“Idealist Consulting is a award winning B Corp with over 20 year’s experience providing Salesforce, marketing automation, and managed services to nonprofits around the globe.”

Source: RevenueBase Database · checked Sep 21, 2026
24
Integral, LLC
Partial evidenceWashington, DC, United StatesHQ checked Sep 21, 202611-5027 contacts →

Partial evidence

“Integral is a leading independent analytical consulting firm specializing in servicing the non-profit community.”

Source: RevenueBase Database · checked Sep 21, 2026
25
National Strategies NSI
Indirect evidenceWashington, DC, United StatesHQ checked Sep 21, 202651-20023 contacts →

Indirect evidence

“National Strategies (NSI) is a U.S.”

Source: RevenueBase Database · checked Sep 21, 2026

Showing 25 of 381 consulting for nonprofit organizations based in Washington, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,659 reachable decision-makers.

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Consulting for nonprofit organizations based in Washington, United States at a glance

As of Sep 21, 2026
45.0%Verified-email coverage
9.7Average contacts per company
1-10Median size (employees)
119.9%Largest-city concentration · New York
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
302
11-50
52
51-200
21
201-500
2
501-1,000
1
1,001-5,000
2
10001+
1

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 381 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among consulting for nonprofit organizations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in Washington, United States whose own description of what they do matches “consulting for nonprofit organizations”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names consulting for nonprofit organizations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among consulting for nonprofit organizations, and records with no verified work email. Companies headquartered outside Washington are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 1,659 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Consulting for nonprofit organizations by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names consulting for nonprofit organizations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many consulting for nonprofit organizations are there based in Washington, United States?

RevenueBase identified 381 consulting for nonprofit organizations headquartered in Washington, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Nonprofit Hr, Powered By Onedigital, headquartered in Washington, tops this list with the largest team on record.

Which city has the most consulting for nonprofit organizations?

New York leads with 457 headquartered companies, followed by Washington (381) and Chicago (307).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,659 verified decision-maker contacts tracked across these 381 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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Related lists

Consulting for nonprofit organizations by geography

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.

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