Company lists · Data refreshed September 2026

Top 25 Grassroots consulting firms based in the United States

Name: Grassroots consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 7,348 companies tracked

RevenueBase identified 7,348 grassroots consulting firms headquartered in the United States as of September 2026 and tracks 49,800 professional contacts across them, including 14,797 with verified work emails. Washington is the largest hub.

This list covers grassroots consulting firms headquartered in the 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 28, 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 28, 2026 86% judged on-target in blind review

7,348Companies

49,800Contacts tracked

14,797Verified emails

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The 25 largest grassroots consulting firms based in the United States

Ranked by team size

Top 25 of 7,348 grassroots consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to grassroots consulting firms: 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	Bank Of The West	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	n/a	4,751 contacts →
	Indirect evidence “We help businesses and nonprofits grow, communicate, and succeed, professionally and affordably.” Source: RevenueBase Database · checked Sep 28, 2026
2	Lucas Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	10001+	756 contacts →
	Partial evidence “Ultimate Minds is a professional consulting and marketing firm dedicated to empowering businesses, nonprofits, and startups with smart, affordable, and results-driven solutions.” Source: RevenueBase Database · checked Sep 28, 2026
3	CCS Fundraising	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	728 contacts →
	Indirect evidence “For over 75 years, CCS Fundraising has empowered many of the world’s greatest organizations to advance some of the most important causes in history.” Source: RevenueBase Database · checked Sep 28, 2026
4	365 Media	Indirect evidence	Portsmouth, NH, United StatesHQ checked Sep 28, 2026	n/a	460 contacts →
	Indirect evidence “365 Media is a total service provider business community building and audience engagement.” Source: RevenueBase Database · checked Sep 28, 2026
5	The Bridgespan Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	201-500	443 contacts →
	Indirect evidence “The Bridgespan Group is a global nonprofit that strives to make the world more equitable and just.” Source: RevenueBase Database · checked Sep 28, 2026
6	Lutheran Services In Iowa	Indirect evidence	Des Moines, IA, United StatesHQ checked Sep 28, 2026	501-1,000	415 contacts →
	Indirect evidence “Making a difference takes leadership and courage.” Source: RevenueBase Database · checked Sep 28, 2026
7	The Outreach Team	Partial evidence	Ithaca, NY, United StatesHQ checked Sep 28, 2026	201-500	398 contacts →
	Partial evidence “The Outreach Team is a national consulting firm working to make the world a better place.” Source: RevenueBase Database · checked Sep 28, 2026
8	Deep Water Point & Associates	Indirect evidence	Annapolis, MD, United StatesHQ checked Sep 28, 2026	201-500	350 contacts →
	Indirect evidence “Deep Water Point & Associates is composed of industry veterans and government experts who dedicate their expertise to maximize our clients’ competitive edge.” Source: RevenueBase Database · checked Sep 28, 2026
9	Fieldworks	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	5,001-10,000	336 contacts →
	Partial evidence “FieldWorks brings innovative grassroots and field strategies to Democratic and progressive campaigns and organizations.” Source: RevenueBase Database · checked Sep 28, 2026
10	Iquasar LLC	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 28, 2026	201-500	312 contacts →
	Indirect evidence “Based in Sterling, Virginia, iQuasar LLC, with over 20 years of experience, we help small and medium businesses grow in the federal marketplace through Proposal Development…” Source: RevenueBase Database · checked Sep 28, 2026
11	Csrs, A Westwood Company	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 28, 2026	51-200	305 contacts →
	Indirect evidence “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Source: RevenueBase Database · checked Sep 28, 2026
12	Oswego County Opportunities, INC	Indirect evidence	Fulton, NY, United StatesHQ checked Sep 28, 2026	501-1,000	303 contacts →
	Indirect evidence “Oswego County Opportunities (OCO) inspires partnerships and provides services that empower people, support communities and change lives.” Source: RevenueBase Database · checked Sep 28, 2026
13	SSA Consultants	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 28, 2026	n/a	258 contacts →
	Indirect evidence “We are partners and advisors of leading organizations and governments, bound to and inspired by a mission of helping our clients improve their performance.” Source: RevenueBase Database · checked Sep 28, 2026
14	Cornerstone Government Affairs	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	201-500	255 contacts →
	Indirect evidence “Cornerstone Government Affairs is a full-service, bipartisan, employee-owned firm specializing in government relations and lobbying, public affairs, strategic communications, and…” Source: RevenueBase Database · checked Sep 28, 2026
15	TCC Group	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	n/a	232 contacts →
	Indirect evidence “TCC Group collaborates with leaders to solve complex social problems.” Source: RevenueBase Database · checked Sep 28, 2026
16	VTM Group	Indirect evidence	Beaverton, OR, United StatesHQ checked Sep 28, 2026	51-200	221 contacts →
	Indirect evidence “VTM Group is the industry-leading, single source for launching, managing and promoting standard setting alliances, initiatives, and collaborative programs in the technology…” Source: RevenueBase Database · checked Sep 28, 2026
17	IFF Cdfi	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	216 contacts →
	Indirect evidence “Grounded in equity and deep sector expertise, IFF champions nonprofits to shape more equitable and vibrant communities through community-centered lending, development, and real…” Source: RevenueBase Database · checked Sep 28, 2026
18	Nonprofit Finance Fund	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	212 contacts →
	Partial evidence “Financing for nonprofits https://nff.org/our-work/financing/#Consulting for nonprofits https://nff.org/our-work/consulting/#Partnerships with funders and networks…” Source: RevenueBase Database · checked Sep 28, 2026
19	M R	Indirect evidence	Washington, United StatesHQ checked Sep 28, 2026	51-200	208 contacts →
	Indirect evidence “We are M+R.” Source: RevenueBase Database · checked Sep 28, 2026
20	Social Impact	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	51-200	200 contacts →
	Partial evidence “Social Impact is a global development management consulting firm.” Source: RevenueBase Database · checked Sep 28, 2026
21	DCI	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	198 contacts →
	Strong evidence “DCI Group is an independent public affairs consulting firm that specializes in public relations, crisis management, grassroots engagement, and digital advocacy.” Source: RevenueBase Database · checked Sep 28, 2026
22	Lilly & Company	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	n/a	187 contacts →
	Partial evidence “Since its inception, Lilly & Company has built a unique and comprehensive strategy for providing the best possible services available in political fundraising and grassroots…” Source: RevenueBase Database · checked Sep 28, 2026
23	Atlas Advisors, LLC	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 28, 2026	201-500	172 contacts →
	Indirect evidence “Founded by a former U.S.” Source: RevenueBase Database · checked Sep 28, 2026
24	Mcallister & Quinn	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
25	Invariant	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	166 contacts →
	Indirect evidence “Invariant is a bipartisan business advisory firm, providing strategic advice to companies, trade associations, non-profits, and individuals on how to make Washington work for them.” Source: RevenueBase Database · checked Sep 28, 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: grassroots consulting firms. 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 grassroots consulting firms.
Partial evidence: Its own public description names part of grassroots consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name grassroots consulting firms. 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 7,348 grassroots consulting firms based in the United States

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Grassroots consulting firms based in the United States at a glance

As of Sep 28, 2026

29.7%Verified-email coverage

6.8Average contacts per company

1-10Median size (employees)

6.0%Largest-city concentration · Washington

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

6,281

11-50

872

51-200

145

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 7,348 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 grassroots consulting firms, 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 the United States whose own description of what they do matches “grassroots consulting firms”. 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 grassroots consulting firms), 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 grassroots consulting firms, and records with no verified work email. Companies headquartered outside United States 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, 14,797 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 28, 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.

Grassroots consulting firms by metro

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 grassroots consulting firms, 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 grassroots consulting firms are there based in the United States?

RevenueBase identified 7,348 grassroots consulting firms headquartered in the 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?

Bank Of The West, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most grassroots consulting firms?

Washington leads with 444 headquartered companies, followed by New York (310) and Chicago (206).

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 14,797 verified decision-maker contacts tracked across these 7,348 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 28, 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.