Company lists · Data refreshed September 2026

Top 25 Nonprofit management consulting services based in Washington, United States

Name: Nonprofit management consulting services based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 362 companies tracked

RevenueBase identified 362 nonprofit management consulting services headquartered in Washington, United States as of September 2026 and tracks 3,468 professional contacts across them, including 1,420 with verified work emails. Across the United States, New York is the largest hub for this category (462 companies); Washington follows with 362.

This list covers nonprofit management consulting services 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 29, 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 29, 2026 86% judged on-target in blind review

362Companies

3,468Contacts tracked

1,420Verified emails

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The 25 largest nonprofit management consulting services based in Washington, United States

Ranked by team size

Top 25 of 362 nonprofit management consulting services based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to nonprofit management consulting services: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Nonprofit Hr, Powered By Onedigital	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	10001+	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 29, 2026
2	Arabella Advisors	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	201-500	227 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 29, 2026
3	M R	Indirect evidence	Washington, United StatesHQ checked Sep 29, 2026	51-200	208 contacts →
	Indirect evidence “We are M+R.” Source: RevenueBase Database · checked Sep 29, 2026
4	Mcallister & Quinn	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	170 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 29, 2026
5	Herren Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	142 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 29, 2026
6	Hilltop Consultants	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	101 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 29, 2026
7	ORR Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	99 contacts →
	Partial evidence “Orr Group was born out of a need for event management and fundraising support in the philanthropic sector.” Source: RevenueBase Database · checked Sep 29, 2026
8	Raffa, PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	1,001-5,000	87 contacts →
	Indirect evidence “Top accounting firm Raffa, P.C.” Source: RevenueBase Database · checked Sep 29, 2026
9	Humentum	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	81 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 29, 2026
10	Willpower Consultation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	75 contacts →
	Indirect evidence “Willpower Consultation offers direct solutions for your corporate strategy.” Source: RevenueBase Database · checked Sep 29, 2026
11	Avalon Consulting Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	74 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 29, 2026
12	Georgetown Global Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	70 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 29, 2026
13	Lautman Maska Neill & Company	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	64 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 29, 2026
14	Freedman Consulting, LLC	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	61 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 29, 2026
15	Strategix Management LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	201-500	59 contacts →
	Partial 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 29, 2026
16	Elevate Smart Grants For Powerful Social Change	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	55 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 29, 2026
17	Boardsource	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	53 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 29, 2026
18	Ward Circle Strategies	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	52 contacts →
	Indirect evidence “Ward Circle Strategies, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
19	HAN Group LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	51 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 29, 2026
20	Capital Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	43 contacts →
	Strong 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 29, 2026
21	Mckinley Advisors	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	32 contacts →
	Partial evidence “McKinley Advisors, a Smithbucklin company, is an award-winning consulting firm dedicated to accelerating associations' positive impact on the world.” Source: RevenueBase Database · checked Sep 29, 2026
22	Integral, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	27 contacts →
	Partial evidence “Integral is a leading independent analytical consulting firm specializing in servicing the non-profit community.” Source: RevenueBase Database · checked Sep 29, 2026
23	High Impact Partners HIP	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	21 contacts →
	Strong evidence “Management Consulting Firm * info@hipimpact.com.” Source: RevenueBase Database · checked Sep 29, 2026
24	Quatt Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	19 contacts →
	Indirect evidence “Quatt Associates, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
25	CSR Communications	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	11-50	18 contacts →
	Indirect evidence “We're the leading experts changing the way organizations manage change.” Source: RevenueBase Database · checked Sep 29, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: nonprofit management consulting services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names nonprofit management consulting services.
Partial evidence: Its own public description names part of nonprofit management consulting services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nonprofit management consulting services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 362 nonprofit management consulting services based in Washington, United States

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Nonprofit management consulting services based in Washington, United States at a glance

As of Sep 29, 2026

40.9%Verified-email coverage

9.6Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

287

11-50

51-200

201-500

1,001-5,000

10001+

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 362 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 nonprofit management consulting services, 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 “nonprofit management consulting services”. 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 nonprofit management consulting services), 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 nonprofit management consulting services, 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, 1,420 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 29, 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.

Nonprofit management consulting services 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 nonprofit management consulting services, 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 nonprofit management consulting services are there based in Washington, United States?

RevenueBase identified 362 nonprofit management consulting services 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 in the United States has the most nonprofit management consulting services?

New York leads the United States with 462 headquartered companies, followed by Washington (362) and Chicago (303).

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 1,420 verified decision-maker contacts tracked across these 362 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 29, 2026.

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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.