Company lists · Data verified August 2026

Top 25 Advocacy consulting firms based in Washington, United States

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 870 companies tracked

There are 870 advocacy consulting firms headquartered in Washington, United States (RevenueBase, August 2026). RevenueBase tracks 9,343 professional contacts across them, including 4,738 with verified work emails and 4,241 with mobile numbers. Washington is the largest hub.

This list covers advocacy consulting firms headquartered in Washington, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

870Companies

9,343Contacts tracked

4,738Verified emails

4,241Mobile numbers

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The 25 largest advocacy consulting firms based in Washington, United States

Ranked by team size

Top 25 of 870 advocacy consulting firms based in Washington, United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	DDC Public Affairs	Washington, DC	51-200	411	44
2	Cornerstone Government Affairs	Washington, DC	201-500	256	176
3	Missionwired	Washington, DC	201-500	229	175
4	DCI	Washington, DC	51-200	194	63
5	Mcallister & Quinn	Washington, DC	51-200	170	109
6	Invariant	Washington, DC	51-200	169	104
7	TSD Communications, INC	Washington	51-200	166	6
8	Rational 360	Washington, DC	51-200	157	94
9	Fenton	Washington, DC	51-200	145	64
10	Public & Government Affairs At Edelman	Washington, DC	201-500	125	58
11	National Journal	Washington, DC	51-200	123	62
12	Narrative Strategies	Washington, DC	51-200	111	81
13	Powers LAW	Washington, DC	51-200	99	69
14	LSG	Washington, DC	51-200	86	33
15	VAN Scoyoc Associates	Washington, DC	51-200	82	46
16	Cassidy & Associates	Washington, DC	51-200	78	34
17	Reservoir Communications Group	Washington, DC	51-200	76	68
18	Gravity Research	Washington, DC	51-200	69	54
19	NJI	Washington, DC	51-200	68	36
20	CQ	Washington, DC	201-500	67	10
21	Sherry Matthews Group	Washington, DC	51-200	62	50
22	Arko Advice	Washington, DC	51-200	53	15
23	Hilltop Public Solutions	Washington, DC	51-200	52	30
24	Ward Circle Strategies	Washington, DC	51-200	51	29
25	Carmen Group	Washington, DC	51-200	51	8

Showing 25 of 870 advocacy consulting firms based in Washington, United States

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Advocacy consulting firms based in Washington, United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

WashingtonLargest hub · 870 HQs

4,241Contacts with mobile numbers

39Emails re-verified in last 30 days

Companies by employee count

1-10

621

11-50

199

51-200

201-500

Advocacy consulting firms by metro in the United States

Metro	Companies
Advocacy consulting firms in Washington	870
Advocacy consulting firms in New York	234
Advocacy consulting firms in Chicago	140
Advocacy consulting firms in Sacramento	132
Advocacy consulting firms in Los Angeles	130
Advocacy consulting firms in Austin	121
Advocacy consulting firms in Atlanta	104
Advocacy consulting firms in Boston	91

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “advocacy consulting firms”, with match quality audited by blind human judging, and headquartered in Washington, United States.
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: Contact records re-verify on a rolling cadence; 39 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many advocacy consulting firms are there based in Washington, United States?

There are 870 advocacy consulting firms headquartered in Washington, United States as of August 2026 (RevenueBase).

What is the largest company on this list?

DDC Public Affairs, headquartered in Washington, tops this list with the largest team on record.

Which city has the most advocacy consulting firms?

Washington leads with 870 headquartered companies, followed by New York (234) and Chicago (140).

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 4,738 verified decision-maker contacts tracked across these 870 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.