What industries are largest?

A skilled manufacturing worker operates industrial machinery, representing one of the many industries that help drive Long Island's economy. While healthcare, education, and research now employ the largest share of the workforce, manufacturing, engineering, aerospace, and advanced technology continue to play important roles across the region. File photo: Winnievinzence, licensed. — A skilled manufacturing worker operates industrial machinery, representing one of the many industries that help drive Long Island’s economy. While healthcare, education, and research now employ the largest share of the workforce, manufacturing, engineering, aerospace, and advanced technology continue to play important roles across the region. File photo: Winnievinzence, licensed.

Long Island’s economy is driven by healthcare, education, government, scientific research, technology, defense, finance, tourism, and retail. While historically known for aerospace manufacturing, today’s economy is far more diverse, with healthcare and education leading employment across Nassau and Suffolk counties.

In Short

Healthcare is Long Island’s largest industry, followed by education, government, scientific research, professional services, transportation, tourism, retail, construction, manufacturing, and agriculture. Together, these industries support millions of residents and thousands of businesses throughout Nassau County and Suffolk County.

What Are Long Island’s Largest Industries?

Healthcare has become Long Island’s largest industry, with hospitals, physician groups, outpatient centers, nursing facilities, and medical research institutions employing tens of thousands of people. Major healthcare providers continue to expand throughout the region as the population grows and ages.

Education is another cornerstone of the local economy. Public school districts, colleges, and universities – including Stony Brook University and Farmingdale State College – support thousands of teaching, research, healthcare, and administrative jobs.

Government also represents one of the island’s largest employment sectors. Nassau County, Suffolk County, towns, villages, school districts, law enforcement agencies, and transportation providers collectively employ tens of thousands of workers.

Long Island remains an important center for scientific research, defense, aerospace, engineering, financial services, technology, tourism, construction, agriculture, and retail. Attractions such as beaches, wineries, parks, and cultural destinations help support a thriving visitor economy, while the East End continues to produce wine, seafood, and agricultural products that are recognized throughout New York.

Quick Facts

Industry	Primary Activities
Healthcare	Hospitals, medical centers, physician practices, research, and outpatient care.
Education	Public schools, colleges, universities, and research institutions.
Government	County, town, village, public safety, and transportation services.
Science & Technology	Research laboratories, engineering, defense, aerospace, and innovation.
Tourism & Hospitality	Beaches, wineries, restaurants, hotels, parks, and attractions.
Retail & Professional Services	Shopping, banking, finance, legal services, and business support.
Agriculture	Vineyards, wineries, farms, seafood, nurseries, and specialty crops.

Long Island’s economy has evolved from its manufacturing roots into one of the most diverse regional economies in the Northeast. Today, healthcare, education, government, research, tourism, technology, and agriculture work together to support a vibrant business community and provide employment opportunities across the island.