Company lists · Data refreshed September 2026

Top 15 Legislative affairs consultants based in Boston, United States

RevenueBase identified 27 legislative affairs consultants headquartered in Boston, United States as of September 2026 and tracks 131 professional contacts across them, including 64 with verified work emails. Washington is the largest hub.

This list covers legislative affairs consultants headquartered in Boston, 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
27Companies
131Contacts tracked
64Verified emails
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The 15 largest legislative affairs consultants based in Boston, United States

Ranked by team size
Top 15 of 27 legislative affairs consultants based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legislative affairs consultants: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-1018 contacts →

Indirect evidence

“At Shawmut Strategies Group, we make government more accessible so our clients can thrive.”

Source: RevenueBase Database · checked Sep 20, 2026
2Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 202611-5016 contacts →

Partial evidence

“Tremont Strategies Group is a full-service government affairs and public-policy consulting firm offering a broad suite of practices and a steadfast commitment to delivering the…”

Source: RevenueBase Database · checked Sep 20, 2026
3Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-1013 contacts →

Partial evidence

“Smith, Costello & Crawford is a regulatory and legislative policy firm dedicated to helping our clients achieve success through consulting, lobbying, and law services.”

Source: RevenueBase Database · checked Sep 20, 2026
4Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-1011 contacts →

Indirect evidence

“Since 2001, Charles Group Consulting (CGC) has provided its clients with unparalleled access to state government and guidance toward achieving successful outcomes for their…”

Source: RevenueBase Database · checked Sep 20, 2026
5Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-1010 contacts →

Indirect evidence

“Building and launching a successful strategy requires more than just getting you in the door with the right policymakers.”

Source: RevenueBase Database · checked Sep 20, 2026
6Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 202611-509 contacts →

Indirect evidence

“Based in Boston with offices in Washington DC, Maine and California, Serlin Haley offers a full range of government relations services to businesses and trade organizations at the…”

Source: RevenueBase Database · checked Sep 20, 2026
7Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-106 contacts →

Partial evidence

“At The Brennan Group, our mission is to provide our clients with successful government affairs strategies.”

Source: RevenueBase Database · checked Sep 20, 2026
8Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 202611-503 contacts →

Indirect evidence

“Consensus Strategies is a national consulting firm specializing in land use politics, public opinion research, and strategic advocacy.”

Source: RevenueBase Database · checked Sep 20, 2026
9Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-103 contacts →

Partial evidence

“Government Relations experts specializing in Legislative and Executive Branch lobbying, Appropriations and Funding, and Regulatory matters.”

Source: RevenueBase Database · checked Sep 20, 2026
10Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-102 contacts →

Partial evidence

“The Suffolk Group, LLC is a multidisciplinary professional services firm, specializing in improving business performance through government affairs.”

Source: RevenueBase Database · checked Sep 20, 2026
11Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-102 contacts →

Indirect evidence

“BetterSector LLC is a full-service consulting firm serving public sector agencies and non-profit organizations across the country.”

Source: RevenueBase Database · checked Sep 20, 2026
12Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-102 contacts →

Partial evidence

“Oak & Argyle is a full-service government affairs, strategic communications, and real estate development consulting firm.”

Source: RevenueBase Database · checked Sep 20, 2026
13Partial evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-101 contacts →

Partial evidence

“The Graves Group is a public affairs, lobbying and political consulting firm headquartered in Boston, Massachusetts with operations in New York and Washington, D.C.”

Source: RevenueBase Database · checked Sep 20, 2026
14Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-101 contacts →

Indirect evidence

“27 South Strategies is a people-powered government relations firm, rewriting the playbook at all levels of government.”

Source: RevenueBase Database · checked Sep 20, 2026
15Indirect evidenceBoston, MA, United StatesHQ checked Sep 20, 20261-101 contacts →

Indirect evidence

“Political insight.”

Source: RevenueBase Database · checked Sep 20, 2026

Showing 15 of 27 legislative affairs consultants based in Boston, United States

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Legislative affairs consultants based in Boston, United States at a glance

As of Sep 20, 2026
48.9%Verified-email coverage
4.9Average contacts per company
1-10Median size (employees)
1618.5%Largest-city concentration · Washington
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
22
11-50
5

Email recency for this list is measured across the whole United States list rather than for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 27 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 legislative affairs consultants, 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 Boston, United States whose own description of what they do matches “legislative affairs consultants”. 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 legislative affairs consultants), 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 legislative affairs consultants, and records with no verified work email. Companies headquartered outside Boston 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, 64 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.

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 legislative affairs consultants, 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 legislative affairs consultants are there based in Boston, United States?

RevenueBase identified 27 legislative affairs consultants headquartered in Boston, 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?

Shawmut Strategies Group, headquartered in Boston, tops this list with the largest team on record.

Which city has the most legislative affairs consultants?

Washington leads with 437 headquartered companies, followed by Sacramento (78) and Austin (62).

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 64 verified decision-maker contacts tracked across these 27 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.