Company lists · Data refreshed September 2026

Top 25 Nonprofit communications agencies based in Washington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 149 companies tracked

RevenueBase identified 149 nonprofit communications agencies headquartered in Washington, United States as of September 2026 and tracks 2,956 professional contacts across them, including 1,321 with verified work emails. New York is the largest hub.

This list covers nonprofit communications agencies 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 20, 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 20, 2026 86% judged on-target in blind review

149Companies

2,956Contacts tracked

1,321Verified emails

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The 25 largest nonprofit communications agencies based in Washington, United States

Ranked by team size

Top 25 of 149 nonprofit communications agencies based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to nonprofit communications agencies: 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	GMMB	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	239 contacts →
	Indirect evidence “We’re bold.” Source: RevenueBase Database · checked Sep 20, 2026
2	Missionwired	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	226 contacts →
	Indirect evidence “At MissionWired, we believe your world-changing cause deserves more than marginal gains.” Source: RevenueBase Database · checked Sep 20, 2026
3	SKDK	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	220 contacts →
	Partial evidence “SKDK provides strategic advice, public relations, crisis communications, advertising, direct mail, and research to national and international companies, advocacy organizations…” Source: RevenueBase Database · checked Sep 20, 2026
4	M R	Indirect evidence	Washington, United StatesHQ checked Sep 20, 2026	51-200	208 contacts →
	Indirect evidence “We are M+R.” Source: RevenueBase Database · checked Sep 20, 2026
5	TSD Communications, INC	Indirect evidence	Washington, United StatesHQ checked Sep 20, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
6	O'brien Garrett	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	n/a	152 contacts →
	Strong evidence “O'Brien Garrett is a comprehensive fundraising and communications company serving some of the nation's top nonprofits.” Source: RevenueBase Database · checked Sep 20, 2026
7	LSG	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	85 contacts →
	Partial evidence “We work with corporations, trade associations, and nonprofits to change hearts and minds, move public opinion, and help brands connect to the public conscience in a rapidly…” Source: RevenueBase Database · checked Sep 20, 2026
8	Seven Letter	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	74 contacts →
	Strong evidence “Seven Letter, formerly Blue Engine + JDA, provides strategic communications solutions to the complex challenges facing corporations, nonprofits, coalitions and associations.” Source: RevenueBase Database · checked Sep 20, 2026
9	Mdb, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	70 contacts →
	Partial evidence “MDB, Inc, is a small business that helps clients achieve their communication and program goals.” Source: RevenueBase Database · checked Sep 20, 2026
10	Stratacomm	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	67 contacts →
	Partial evidence “Stratacomm is an independently owned marketing communications agency with national reach, turning insights into powerful communications.” Source: RevenueBase Database · checked Sep 20, 2026
11	Link Strategic Partners	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	54 contacts →
	Partial evidence “LINK is a is a full-service, DC-based social impact firm, with a focus on strategic communications and stakeholder engagement.” Source: RevenueBase Database · checked Sep 20, 2026
12	Cgcn Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	52 contacts →
	Partial evidence “CGCN Group is an integrated advocacy and strategic communications firm that specializes in helping Fortune 500 companies, non-profits, and trade associations navigate complex…” Source: RevenueBase Database · checked Sep 20, 2026
13	Advocacy Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	51 contacts →
	Indirect evidence “Advocacy Associates specializes in strategic grassroots and advocacy approaches designed to address the individual needs of our clients - no cookie cutter approaches are allowed.” Source: RevenueBase Database · checked Sep 20, 2026
14	LOT Sixteen	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	48 contacts →
	Partial evidence “We deliver policy and communications support that is bracingly honest, refreshingly creative and expertly executed.” Source: RevenueBase Database · checked Sep 20, 2026
15	Hager Sharp	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	38 contacts →
	Partial evidence “At Hager Sharp, we’ve dedicated the last 50 years to creating communications campaigns for organizations committed to improving health, advancing education, transforming our…” Source: RevenueBase Database · checked Sep 20, 2026
16	Adfero	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	36 contacts →
	Partial evidence “Adfero is a communications agency with an entrepreneurial mindset.” Source: RevenueBase Database · checked Sep 20, 2026
17	Glen Echo Group, An Orchestra Company	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “Coalition builders, campaign creators and policy wonks, the Glen Echo Group transforms complicated tech and innovation challenges into positive outcomes for the digital world.” Source: RevenueBase Database · checked Sep 20, 2026
18	West END Strategy Team	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “Strategic communications succeeds when it inspires change.” Source: RevenueBase Database · checked Sep 20, 2026
19	Mccabe Message Partners	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “McCabe Message Partners is a niche public relations firm that helps clients working on health, healthcare and related issues craft and spread their message.” Source: RevenueBase Database · checked Sep 20, 2026
20	Collaborative Communications Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “Collaborative Communications is a national communications consultancy dedicated to efforts that help build a more educated, engaged, and equal society, where every child and young…” Source: RevenueBase Database · checked Sep 20, 2026
21	Leonard Resource Group LRG	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “Leonard Resource Group (LRG) was founded in 1996 with a single contract and a staff of three.” Source: RevenueBase Database · checked Sep 20, 2026
22	Susan Davis International	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “For more than 40 years we’ve been helping clients solve problems, solidify reputations, create new programs, deal with crisis, communicate with key audiences and achieve…” Source: RevenueBase Database · checked Sep 20, 2026
23	Curley Company	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	20 contacts →
	Indirect evidence “We are on a mission to rethink, redefine and reimagine what’s possible for our clients, teams, and industry.” Source: RevenueBase Database · checked Sep 20, 2026
24	Mission Partners, Benefit LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Mission Partners guides purpose-driven organizations in realizing their greatest social impact.” Source: RevenueBase Database · checked Sep 20, 2026
25	Isom Global Strategies	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Partial evidence “We deliver high-impact, KPI-driven campaigns for enterprise, federal, and nonprofit clients across traditional and digital channels.” Source: RevenueBase Database · checked Sep 20, 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 communications agencies. 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 communications agencies.
Partial evidence: Its own public description names part of nonprofit communications agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nonprofit communications agencies. 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 149 nonprofit communications agencies based in Washington, United States

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Nonprofit communications agencies based in Washington, United States at a glance

As of Sep 20, 2026

44.7%Verified-email coverage

19.8Average contacts per company

1-10Median size (employees)

149.0%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

102

11-50

51-200

201-500

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 149 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 communications agencies, 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 communications agencies”. 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 communications agencies), 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 communications agencies, 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, 1,321 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 20, 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 communications agencies 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 communications agencies, 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 communications agencies are there based in Washington, United States?

RevenueBase identified 149 nonprofit communications agencies 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?

GMMB, headquartered in Washington, tops this list with the largest team on record.

Which city has the most nonprofit communications agencies?

New York leads with 222 headquartered companies, followed by Washington (149) and Los Angeles (134).

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 1,321 verified decision-maker contacts tracked across these 149 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 20, 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.