Company lists · Data refreshed September 2026

Top 25 Commercial property and casualty insurers based in the United States

Name: Commercial property and casualty insurers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 10,281 companies tracked

RevenueBase identified 10,281 commercial property and casualty insurers headquartered in the United States as of September 2026 and tracks 674,944 professional contacts across them, including 264,276 with verified work emails. Rolling Meadows is the largest hub.

This list covers commercial property and casualty insurers 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 19, 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 19, 2026 86% judged on-target in blind review

10,281Companies

674,944Contacts tracked

264,276Verified emails

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The 25 largest commercial property and casualty insurers based in the United States

Ranked by team size

Top 25 of 10,281 commercial property and casualty insurers based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to commercial property and casualty insurers: 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	Progressive Insurance	Indirect evidence	Mayfield Village, OH, United StatesHQ checked Sep 19, 2026	10001+	39,169 contacts →
	Indirect evidence “Every journey has a beginning, and wherever you are on your career path, we want to help you along the way.” Source: RevenueBase Database · checked Sep 19, 2026
2	Farmers Insurance	Partial evidence	Woodland Hills, CA, United StatesHQ checked Sep 19, 2026	10001+	39,066 contacts →
	Partial evidence “The companies comprising the Farmers Insurance Group of Companies® currently make up one of the country's largest insurers of vehicles, homes and small businesses, and provide a…” Source: RevenueBase Database · checked Sep 19, 2026
3	AFLAC	Indirect evidence	Columbus, GA, United StatesHQ checked Sep 19, 2026	10001+	33,480 contacts →
	Indirect evidence “Over 50 Million people worldwide have chosen Aflac because of our commitment to providing customers with the confidence that comes from knowing they have assistance in being…” Source: RevenueBase Database · checked Sep 19, 2026
4	Travelers	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	10001+	32,682 contacts →
	Indirect evidence “Travelers provides insurance coverage to protect the things that are important to you – your home, your car, your valuables and your business.” Source: RevenueBase Database · checked Sep 19, 2026
5	Liberty Mutual Insurance	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	10001+	30,330 contacts →
	Indirect evidence “At Liberty Mutual, we believe progress happens when people feel secure.” Source: RevenueBase Database · checked Sep 19, 2026
6	AIG	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	10001+	23,438 contacts →
	Indirect evidence “American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Source: RevenueBase Database · checked Sep 19, 2026
7	MARSH	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	10001+	15,852 contacts →
	Indirect evidence “We help our clients and colleagues grow, and our communities thrive, by protecting and promoting Possibility.” Source: RevenueBase Database · checked Sep 19, 2026
8	HUB International	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	10001+	14,217 contacts →
	Indirect evidence “Hi, we’re HUB.” Source: RevenueBase Database · checked Sep 19, 2026
9	Lockton	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	10001+	13,482 contacts →
	Indirect evidence “What makes Lockton stand apart is also what makes us better: independence.” Source: RevenueBase Database · checked Sep 19, 2026
10	USI Insurance Services	Strong evidence	Valhalla, NY, United StatesHQ checked Sep 19, 2026	10001+	10,303 contacts →
	Strong evidence “USI is one of the largest insurance brokerage and consulting firms in the world, delivering property and casualty, employee benefits, personal risk, program and retirement…” Source: RevenueBase Database · checked Sep 19, 2026
11	Marsh Mclennan Agency	Indirect evidence	White Plains, NY, United StatesHQ checked Sep 19, 2026	10001+	9,086 contacts →
	Indirect evidence “Marsh McLennan Agency, a business of Marsh (NYSE: MRSH), is a leading provider of business insurance, employee health & benefits, retirement & wealth, and private client insurance…” Source: RevenueBase Database · checked Sep 19, 2026
12	Zurich North America	Indirect evidence	Schaumburg, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	8,988 contacts →
	Indirect evidence “Zurich North America is one of the largest providers of insurance solutions and services to businesses and individuals.” Source: RevenueBase Database · checked Sep 19, 2026
13	Colonial Life	Indirect evidence	Columbia, SC, United StatesHQ checked Sep 19, 2026	1,001-5,000	7,742 contacts →
	Indirect evidence “Colonial Life & Accident Insurance Company, a subsidiary of Unum Group, provides financial protection benefits to America’s workers and their families when the unexpected happens.” Source: RevenueBase Database · checked Sep 19, 2026
14	Country Financial	Indirect evidence	Bloomington, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	7,402 contacts →
	Indirect evidence “COUNTRY Financial® provides insurance and financial services for over a million households and businesses across 19 states.” Source: RevenueBase Database · checked Sep 19, 2026
15	CNA Insurance	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,984 contacts →
	Indirect evidence “CNA is one of the largest U.S.” Source: RevenueBase Database · checked Sep 19, 2026
16	FM	Indirect evidence	Johnston, RI, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,351 contacts →
	Indirect evidence “For nearly 200 years, FM has empowered businesses worldwide to manage risk, prevent loss, and build resilience.” Source: RevenueBase Database · checked Sep 19, 2026
17	Erie Insurance Group	Partial evidence	Erie, PA, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,321 contacts →
	Partial evidence “From our modest roots starting in 1925 as a Pennsylvania auto insurer, we've grown to become a multi-line insurance company, offering auto, home, business and life insurance…” Source: RevenueBase Database · checked Sep 19, 2026
18	Alliant Insurance Services	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 19, 2026	10001+	6,091 contacts →
	Indirect evidence “Alliant Insurance Services is among the top 5 largest and fastest-growing insurance brokerage and consulting firms in the United States.” Source: RevenueBase Database · checked Sep 19, 2026
19	Kemper	Partial evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,419 contacts →
	Partial evidence “The Kemper family of companies is one of the nation’s leading specialized insurers.” Source: RevenueBase Database · checked Sep 19, 2026
20	Auto-Owners Insurance	Partial evidence	Lansing, MI, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,282 contacts →
	Partial evidence “We are a team of hard working associates and local, independent agents who are proud to be among the nation's largest insurers of Life, Home, Car, and Business; and consistently…” Source: RevenueBase Database · checked Sep 19, 2026
21	The Hanover Insurance Group	Indirect evidence	Worcester, MA, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,132 contacts →
	Indirect evidence “Rooted in our commitment to be with you, every step, The Hanover Insurance Group, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
22	Great American Insurance Group	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,039 contacts →
	Indirect evidence “For more than 150 years, customers have trusted us to protect what matters most to them.” Source: RevenueBase Database · checked Sep 19, 2026
23	Amwins	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 19, 2026	5,001-10,000	4,926 contacts →
	Indirect evidence “Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
24	Amtrust Financial Services, INC	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	5,001-10,000	4,734 contacts →
	Strong evidence “AmTrust Financial Services, Inc, through its subsidiaries, operates as a multinational property and casualty insurance company.” Source: RevenueBase Database · checked Sep 19, 2026
25	The Cincinnati Insurance Companies	Strong evidence	Fairfield, OH, United StatesHQ checked Sep 19, 2026	1,001-5,000	4,539 contacts →
	Strong evidence “The Cincinnati Insurance Company, operating since 1950, stands among the nation's top 25 property casualty insurer groups based on net written premiums.” Source: RevenueBase Database · checked Sep 19, 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: commercial property and casualty insurers. 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 commercial property and casualty insurers.
Partial evidence: Its own public description names part of commercial property and casualty insurers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name commercial property and casualty insurers. 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 10,281 commercial property and casualty insurers based in the United States

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Commercial property and casualty insurers based in the United States at a glance

As of Sep 19, 2026

39.2%Verified-email coverage

65.6Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · Rolling Meadows

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

5,805

11-50

3,036

51-200

730

201-500

195

501-1,000

1,001-5,000

119

5,001-10,000

10001+

225

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 10,281 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 commercial property and casualty insurers, 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 “commercial property and casualty insurers”. 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 commercial property and casualty insurers), 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 commercial property and casualty insurers, 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, 264,276 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 19, 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.

Commercial property and casualty insurers 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 commercial property and casualty insurers, 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 commercial property and casualty insurers are there based in the United States?

RevenueBase identified 10,281 commercial property and casualty insurers 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?

Progressive Insurance, headquartered in Mayfield Village, tops this list with the largest team on record.

Which city has the most commercial property and casualty insurers?

Rolling Meadows leads with 167 headquartered companies, followed by New York (166) and Houston (148).

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 264,276 verified decision-maker contacts tracked across these 10,281 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 19, 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.