Marsh McLennan headquarters details
- Street address
- 1166 Ave of the Americas
- City
- New York City
- State / region
- New York
- ZIP / postal code
- 10036-2774
- Country
- United States
- Phone
- +1 212 345 5000
- Founded
- 1871
- Website
- marshmclennan.com
- Stock
- NYSE: MMC
Location map
Open in Google MapsAll Marsh McLennan office locations
| City | State / region | Country | Type |
|---|---|---|---|
| New York City HQ | New York | United States | Headquarters |
Showing the headquarters of 85 recorded locations. See every location in GraphIQ →
About Marsh McLennan
Marsh McLennan (NYSE: MMC) is headquartered in New York City, New York, United States. Founded in 1871, the company has 85 recorded locations across 14+ countries and employs approximately 95,000 people worldwide.
Where is Marsh McLennan's main office?
Marsh McLennan's main headquarters office is located at 1166 Ave of the Americas, New York City, New York 10036-2774, United States. This is the company's primary corporate address.
Marsh McLennan regional offices
Beyond its headquarters in New York City, Marsh McLennan has recorded locations in United States, Australia, Bahrain, Belgium, Brazil, Canada, Chile, Indonesia and 6 other countries.
Marsh McLennan contact information
The main switchboard for Marsh McLennan headquarters can be reached at +1 212 345 5000. Official website: marshmclennan.com.
What does Marsh McLennan do?
Marsh & McLennan Companies, Inc., doing business as Marsh, operates as a professional services firm. The Firm offers insurance brokerage, risk management, reinsurance, talent management, investment advisory, and consulting services to commercial, consumer, multinational, and public sectors. Marsh serves clients worldwide.
Marsh McLennan competitors & similar companies
Frequently asked questions
Where is Marsh McLennan headquarters?
Marsh McLennan's headquarters is located at 1166 Ave of the Americas, New York City, New York 10036-2774, United States.
How many offices does Marsh McLennan have?
GraphIQ records 85 locations for Marsh McLennan across 14+ countries, as of October 2026.
What is Marsh McLennan's corporate address?
The corporate headquarters address is 1166 Ave of the Americas, New York City, New York 10036-2774, United States.
When was Marsh McLennan founded?
Marsh McLennan was founded in 1871 and employs approximately 95,000 people.
What is Marsh McLennan's phone number?
The main phone number for Marsh McLennan headquarters is +1 212 345 5000.
How many employees does Marsh McLennan have?
Marsh McLennan has approximately 95,000 employees (GraphIQ estimate, 2026).
Is Marsh McLennan a public company?
Yes. Marsh McLennan is publicly traded on NYSE under the ticker MMC.