Company lists · Data refreshed September 2026

Top 25 Public affairs firms based in Ottawa, Canada

Name: Public affairs firms based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 58 companies tracked

RevenueBase identified 58 public affairs firms headquartered in Ottawa, Canada as of September 2026 and tracks 758 professional contacts across them, including 379 with verified work emails. Toronto is the largest hub.

This list covers public affairs firms headquartered in Ottawa, Canada, 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

58Companies

758Contacts tracked

379Verified emails

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The 25 largest public affairs firms based in Ottawa, Canada

Ranked by team size

Top 25 of 58 public affairs firms based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to public affairs 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	Earnscliffe Strategies	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	51-200	84 contacts →
	Indirect evidence “Founded in 1989 and independently owned by our principals, Earnscliffe operates from offices in Ottawa-Gatineau, Toronto and Vancouver.” Source: RevenueBase Database · checked Sep 20, 2026
2	PAA Advisory Conseils	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	67 contacts →
	Strong evidence “PAA is a national public affairs and strategic communications firm.” Source: RevenueBase Database · checked Sep 20, 2026
3	Spark Advocacy	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	41 contacts →
	Indirect evidence “To open minds, you need a clear thought.” Source: RevenueBase Database · checked Sep 20, 2026
4	Tactix Government Relations And Public Affairs	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	36 contacts →
	Indirect evidence “For over 25 years TACTIX has been a trusted advisor to leading Canadian and Fortune 500 companies, offering unparalleled experience in solving complex government relations threats…” Source: RevenueBase Database · checked Sep 20, 2026
5	Mcmillan Vantage	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	34 contacts →
	Indirect evidence “When you have a pressing challenge, McMillan Vantage has the senior expertise with a deep understanding of what you need to know, when you need it most.” Source: RevenueBase Database · checked Sep 20, 2026
6	Compass Rose	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	30 contacts →
	Strong evidence “Compass Rose is a public affairs firm where helping companies and organizations find the common good is at the core of who we are and what we do.” Source: RevenueBase Database · checked Sep 20, 2026
7	Impact Public Affairs Canada	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	28 contacts →
	Strong evidence “Building relationships for over 25 years, Impact Public Affairs is a full-service Canadian firm, based in Ottawa with offices in Toronto, Montreal, Vancouver, Calgary, and Halifax.” Source: RevenueBase Database · checked Sep 20, 2026
8	Sandstone Group	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	24 contacts →
	Strong evidence “Sandstone Group Sandstone Group, based in Ottawa, specializes in providing strategic advice to corporate executives in matters of public affairs, government relations, crisis…” Source: RevenueBase Database · checked Sep 20, 2026
9	Bluesky Strategy Group INC	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	18 contacts →
	Strong evidence “Bluesky Strategy Group delivers public affairs, strategic communications, government relations, and media relations advice and execution.” Source: RevenueBase Database · checked Sep 20, 2026
10	STIFF	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	18 contacts →
	Indirect evidence “Stiff is a strategic communications agency.” Source: RevenueBase Database · checked Sep 20, 2026
11	Maple Leaf Strategies	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “EXPERT Government Relations.” Source: RevenueBase Database · checked Sep 20, 2026
12	Blackbird Strategies	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	12 contacts →
	Strong evidence “Blackbird Strategies is a full-service, values-driven public affairs firm specializing in working with First Nations, businesses, associations, Indigenous communities, and others…” Source: RevenueBase Database · checked Sep 20, 2026
13	Prospectus Associates	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	12 contacts →
	Strong evidence “Prospectus Associates is one of Canada’s leading national public affairs consulting firms that prides itself on delivering high-end personalized service by experienced…” Source: RevenueBase Database · checked Sep 20, 2026
14	3sixty Public Affairs	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	11 contacts →
	Strong evidence “3Sixty Public Affairs, with consultants in Western Canada, Ontario and Québec, is Canada's leader in health sector-focused policy, public affairs and advocacy.” Source: RevenueBase Database · checked Sep 20, 2026
15	Arctech Accelerate	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	11 contacts →
	Indirect evidence “Headquartered in our nation’s capital, Arctech Accelerate is a Canadian management consulting and lobbying firm specializing in helping small and mid-sized businesses navigate…” Source: RevenueBase Database · checked Sep 20, 2026
16	First Lake Solutions	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	10 contacts →
	Indirect evidence “First Lake Solutions provides associations, municipalities and corporations with effective government relations and media relations support.” Source: RevenueBase Database · checked Sep 20, 2026
17	Northstar Public Affairs	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	9 contacts →
	Strong evidence “NorthStar Public Affairs is a boutique public affairs agency which services those in need of smart, effective strategies and support for navigating Canadian politics and…” Source: RevenueBase Database · checked Sep 20, 2026
18	ONE Persuasion	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “ONE is a high-stakes, national, public strategy firm.” Source: RevenueBase Database · checked Sep 20, 2026
19	Winston Wilmont	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	7 contacts →
	Strong evidence “Winston Wilmont is a bespoke public affairs consultancy operating at the intersection of strategy, advocacy and communications.” Source: RevenueBase Database · checked Sep 20, 2026
20	Rkestra	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	6 contacts →
	Strong evidence “RKESTRA is a collective of senior public affairs, government relations, strategic communications, and business development professionals.” Source: RevenueBase Database · checked Sep 20, 2026
21	The Parliamentary Group	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “Government Relations firm based in Ottawa, Canada.” Source: RevenueBase Database · checked Sep 20, 2026
22	Pendulum Group	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	5 contacts →
	Indirect evidence “Canada's premier communications firm.” Source: RevenueBase Database · checked Sep 20, 2026
23	Beacon North Strategies	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	5 contacts →
	Strong evidence “Cutting through the noise, we're Beacon North Strategies - a boutique public affairs firm specializing in strategy, government relations, stakeholder relations, events, and…” Source: RevenueBase Database · checked Sep 20, 2026
24	Constituent Manager Solutions	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “Located in the heart of Canada's capital just minutes away from Parliament Hill, Constituent Manager Solutions provides advisory, communications, digital, data management and…” Source: RevenueBase Database · checked Sep 20, 2026
25	KIT Public Affairs	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	1-10	4 contacts →
	Partial evidence “We’re an independent consulting firm that provides expert, affordable public and government relations services including: Advocacy Grants and Funding Support Policy Communications…” 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: public affairs 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 public affairs firms.
Partial evidence: Its own public description names part of public affairs firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name public affairs 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 58 public affairs firms based in Ottawa, Canada

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Public affairs firms based in Ottawa, Canada at a glance

As of Sep 20, 2026

50.0%Verified-email coverage

13.1Average contacts per company

1-10Median size (employees)

141.4%Largest-city concentration · Toronto

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole Canada list rather than for Ottawa, so it is reported there. Company counts and contact totals on this page are exact for Ottawa, over 58 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 public affairs 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 Ottawa, Canada whose own description of what they do matches “public affairs 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 public affairs 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 public affairs firms, and records with no verified work email. Companies headquartered outside Ottawa 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, 379 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.

Public affairs firms by metro in Canada

Public affairs firms in Toronto82
Public affairs firms in Ottawa58
Public affairs firms in Montreal27

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 public affairs 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 public affairs firms are there based in Ottawa, Canada?

RevenueBase identified 58 public affairs firms headquartered in Ottawa, Canada 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?

Earnscliffe Strategies, headquartered in Ottawa, tops this list with the largest team on record.

Which city has the most public affairs firms?

Toronto leads with 82 headquartered companies, followed by Ottawa (58) and Montreal (27).

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 379 verified decision-maker contacts tracked across these 58 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.