Company lists · Data refreshed September 2026

Top 25 Property and casualty insurers based in the United States

Name: 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 20, 2026 9,179 companies tracked

RevenueBase identified 9,179 property and casualty insurers headquartered in the United States as of September 2026 and tracks 527,972 professional contacts across them, including 186,274 with verified work emails. Houston is the largest hub.

This list covers 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 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

9,179Companies

527,972Contacts tracked

186,274Verified emails

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

Ranked by team size

Top 25 of 9,179 property and casualty insurers based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to 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 20, 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 20, 2026
2	Farmers Insurance	Partial evidence	Woodland Hills, CA, United StatesHQ checked Sep 20, 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 20, 2026
3	Travelers	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 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 20, 2026
4	Liberty Mutual Insurance	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	10001+	30,330 contacts →
	Indirect evidence “At Liberty Mutual, we believe progress happens when people feel secure.” Source: RevenueBase Database · checked Sep 20, 2026
5	AIG	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	10001+	23,438 contacts →
	Indirect evidence “American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Source: RevenueBase Database · checked Sep 20, 2026
6	American Family Insurance	Indirect evidence	Madison, WI, United StatesHQ checked Sep 20, 2026	10001+	17,111 contacts →
	Indirect evidence “For more than 90 years, American Family Insurance has built its reputation on sound principles.” Source: RevenueBase Database · checked Sep 20, 2026
7	State Farm Agent	Indirect evidence	Bloomington, IL, United StatesHQ checked Sep 20, 2026	5,001-10,000	10,979 contacts →
	Indirect evidence “At State Farm®, our mission is to help people manage the risks of everyday life, recover from the unexpected, and realize their dreams.” Source: RevenueBase Database · checked Sep 20, 2026
8	Marsh Mclennan Agency	Indirect evidence	White Plains, NY, United StatesHQ checked Sep 20, 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 20, 2026
9	Zurich North America	Indirect evidence	Schaumburg, IL, United StatesHQ checked Sep 20, 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 20, 2026
10	Mutual Of Omaha	Indirect evidence	Omaha, NE, United StatesHQ checked Sep 20, 2026	1,001-5,000	8,621 contacts →
	Indirect evidence “Founded in 1909, Mutual of Omaha is a highly-rated, Fortune 300 organization offering a variety of insurance and financial products for individuals, businesses and groups…” Source: RevenueBase Database · checked Sep 20, 2026
11	Country Financial	Indirect evidence	Bloomington, IL, United StatesHQ checked Sep 20, 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 20, 2026
12	CNA Insurance	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	5,001-10,000	6,984 contacts →
	Indirect evidence “CNA is one of the largest U.S.” Source: RevenueBase Database · checked Sep 20, 2026
13	FM	Indirect evidence	Johnston, RI, United StatesHQ checked Sep 20, 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 20, 2026
14	Erie Insurance Group	Partial evidence	Erie, PA, United StatesHQ checked Sep 20, 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 20, 2026
15	Kemper	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 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 20, 2026
16	Auto-Owners Insurance	Partial evidence	Lansing, MI, United StatesHQ checked Sep 20, 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 20, 2026
17	The Hanover Insurance Group	Indirect evidence	Worcester, MA, United StatesHQ checked Sep 20, 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 20, 2026
18	Amwins	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 20, 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 20, 2026
19	Amtrust Financial Services, INC	Strong evidence	New York, NY, United StatesHQ checked Sep 20, 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 20, 2026
20	The Cincinnati Insurance Companies	Strong evidence	Fairfield, OH, United StatesHQ checked Sep 20, 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 20, 2026
21	Sentry	Indirect evidence	Stevens Point, WI, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,963 contacts →
	Indirect evidence “Sentry Insurance got its start in 1904, when members of the Wisconsin Retail Hardware Association formed their own insurance company.” Source: RevenueBase Database · checked Sep 20, 2026
22	Shelter Insurance Companies	Strong evidence	Columbia, MO, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,912 contacts →
	Strong evidence “Shelter Insurance® is a property casualty insurance company offering auto and home insurance in addition to several other insurance products, including: Life Insurance Renters…” Source: RevenueBase Database · checked Sep 20, 2026
23	Everest	Strong evidence	Warren, NJ, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,411 contacts →
	Strong evidence “Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…” Source: RevenueBase Database · checked Sep 20, 2026
24	Mercury Insurance	Indirect evidence	Brea, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,186 contacts →
	Indirect evidence “At Mercury, we have been guided by our purpose to help people reduce risk and overcome unexpected events for more than 60 years.” Source: RevenueBase Database · checked Sep 20, 2026
25	Markel	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,151 contacts →
	Indirect evidence “As the insurance operations within the Markel Group Inc.(NYSE: MKL), we leverage a broad array of capabilities and expertise to create intelligent solutions for the most complex…” 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: 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 property and casualty insurers.
Partial evidence: Its own public description names part of 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 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 9,179 property and casualty insurers based in the United States

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Property and casualty insurers based in the United States at a glance

As of Sep 20, 2026

35.3%Verified-email coverage

57.5Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

5,462

11-50

2,697

51-200

574

201-500

172

501-1,000

1,001-5,000

5,001-10,000

10001+

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 9,179 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 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 “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 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 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, 186,274 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.

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

RevenueBase identified 9,179 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 property and casualty insurers?

Houston leads with 119 headquartered companies, followed by New York (110) and Miami (88).

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 186,274 verified decision-maker contacts tracked across these 9,179 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.