Company lists · Data refreshed September 2026

Top 25 Nonprofit consulting providers based in Washington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 239 companies tracked

RevenueBase identified 239 nonprofit consulting providers headquartered in Washington, United States as of September 2026 and tracks 2,829 professional contacts across them, including 1,215 with verified work emails. New York is the largest hub.

This list covers nonprofit consulting providers 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 14, 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 14, 2026 86% judged on-target in blind review

239Companies

2,829Contacts tracked

1,215Verified emails

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The 25 largest nonprofit consulting providers based in Washington, United States

Ranked by team size

Top 25 of 239 nonprofit consulting providers based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to nonprofit consulting providers: 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 14, 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 14, 2026
2	Arabella Advisors	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
3	M R	Indirect evidence	Washington, United StatesHQ checked Sep 14, 2026	51-200	208 contacts →
	Indirect evidence “We are M+R.” Source: RevenueBase Database · checked Sep 14, 2026
4	Global Impact	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	51-200	170 contacts →
	Partial evidence “Global Impact serves as a trusted philanthropy advisor, intermediary, and nonprofit partner for greater giving.” Source: RevenueBase Database · checked Sep 14, 2026
5	Herren Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
6	Hilltop Consultants	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
7	ORR Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	51-200	99 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 14, 2026
8	Raffa, PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	1,001-5,000	87 contacts →
	Indirect evidence “Top accounting firm Raffa, P.C.” Source: RevenueBase Database · checked Sep 14, 2026
9	Humentum	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
10	Avalon Consulting Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
11	Georgetown Global Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
12	Lautman Maska Neill & Company	Strong evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
13	Freedman Consulting, LLC	Strong evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
14	Elevate Smart Grants For Powerful Social Change	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
15	Boardsource	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
16	HAN Group LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
17	Community IT Innovators	Indirect evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	51-200	46 contacts →
	Indirect evidence “Community IT Innovators is a Washington, D.C.” Source: RevenueBase Database · checked Sep 14, 2026
18	Integral, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 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 14, 2026
19	High Impact Partners HIP	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Partial evidence “Management Consulting Firm * info@hipimpact.com.” Source: RevenueBase Database · checked Sep 14, 2026
20	Quatt Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	11-50	19 contacts →
	Indirect evidence “Quatt Associates, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
21	Spark Point Fundraising	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Partial evidence “Spark Point is the resource that nonprofits are hungry for – a thought partner to guide them to an easily implemented, sustainable fundraising strategy and an experienced grant…” Source: RevenueBase Database · checked Sep 14, 2026
22	Bernuth & Williamson	Strong evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	11-50	13 contacts →
	Strong evidence “Bernuth & Williamson provides consulting services in the areas of strategy, change management, and organizational development to leading nonprofits, foundations, associations, and…” Source: RevenueBase Database · checked Sep 14, 2026
23	Innovative Federal Strategies	Indirect evidence	Washington, United StatesHQ checked Sep 14, 2026	11-50	13 contacts →
	Indirect evidence “Innovative Federal Strategies provides big firm results with a small firm feel.” Source: RevenueBase Database · checked Sep 14, 2026
24	Bell Creek Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	11-50	12 contacts →
	Partial evidence “Bell Creek Consulting is a growing mission-‐driven firm launched by alumni of top‐tier strategy consultancies.” Source: RevenueBase Database · checked Sep 14, 2026
25	Abundance Strategies	Strong evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	1-10	11 contacts →
	Strong evidence “For more than ten years, Abundance Strategies (formerly KG Consulting) has been empowering nonprofits to embrace a culture of abundance and helping them to raise millions of…” Source: RevenueBase Database · checked Sep 14, 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 consulting providers. 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 consulting providers.
Partial evidence: Its own public description names part of nonprofit consulting providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nonprofit consulting providers. 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 239 nonprofit consulting providers based in Washington, United States

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Nonprofit consulting providers based in Washington, United States at a glance

As of Sep 14, 2026

42.9%Verified-email coverage

11.8Average contacts per company

1-10Median size (employees)

115.9%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

189

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 239 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 consulting providers, 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 consulting providers”. 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 consulting providers), 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 consulting providers, 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, 1,215 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 14, 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 consulting providers 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 consulting providers, 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 consulting providers are there based in Washington, United States?

RevenueBase identified 239 nonprofit consulting providers 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 nonprofit consulting providers?

New York leads with 277 headquartered companies, followed by Washington (239) and Chicago (201).

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 1,215 verified decision-maker contacts tracked across these 239 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 14, 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.