When most people think of islands, they picture tropical beaches in the Caribbean or Southeast Asia. But did you know the United States is home to some of the world’s most spectacular and largest islands? From volcanic landscapes in Hawaii to glacier-carved wilderness in Alaska, these islands blend size, beauty, and adventure like nowhere else. If you’re planning your 2025 travel bucket list, here are the top 10 largest U.S. islands you absolutely must visit.
Area: 4,028 square miles
Location: Pacific Ocean, State of Hawaii
The Big Island of Hawaii tops the list—it’s larger than all other Hawaiian Islands combined! What makes this island remarkable is its diversity of landscapes: from snow-capped Mauna Kea to black-sand beaches and lush tropical forests.
Hawaii Volcanoes National Park – home to Kīlauea, one of the world’s most active volcanoes.
Mauna Kea Summit – ideal for stargazing.
Kona Coast – world-famous for snorkeling and coffee farms.
- Travel Tip: Visit between April and October for the best weather.
- Official tourism site: Go Hawaii
2. Kodiak Island, Alaska
Area: 3,595 square miles
Location: Gulf of Alaska
Kodiak Island is the second-largest island in the United States and a paradise for outdoor enthusiasts. Known for its Kodiak brown bears and pristine wilderness, this island offers an authentic Alaskan experience.
Kodiak National Wildlife Refuge – home to over 3,500 bears.
Fishing & Kayaking – world-class salmon runs and calm coastal bays.
WWII History – explore Fort Abercrombie State Park.
- Travel Tip: The best time to visit is June to August for mild weather and active wildlife.
- Learn more at Travel Alaska – Kodiak Island
3. Puerto Rico
Area: 3,363 square miles
Location: Caribbean Sea (U.S. Territory)
Puerto Rico is not just large—it’s vibrant, cultural, and full of energy. From Old San Juan’s cobblestone streets to El Yunque National Forest’s waterfalls, this island offers a blend of American convenience and Caribbean flair.
San Juan – colonial architecture and lively nightlife.
El Yunque Rainforest – the only tropical rainforest in the U.S. National Forest System.
Culebra & Vieques – nearby smaller islands with glowing bioluminescent bays.
- Travel Tip: U.S. citizens don’t need a passport to visit!
- Explore more at Discover Puerto Rico
4. Prince of Wales Island, Alaska
Area: 2,577 square miles
Location: Southeastern Alaska
Prince of Wales Island may not be as famous as Kodiak, but it’s equally breathtaking. It’s part of Alaska’s Inside Passage and offers untouched nature, rugged mountains, and native Tlingit culture.
Caving Adventures – explore El Capitan Cave, one of North America’s largest.
Fishing Villages – like Craig and Klawock, rich with Alaskan charm.
Hiking & Wildlife – eagles, black bears, and endless trails.
- Travel Tip: Access by ferry from Ketchikan; ideal for adventure travelers.
- Details: Alaska.org – Prince of Wales Island
5. Chichagof Island, Alaska
Area: 2,048 square miles
Location: Alaska’s Archipelago
Chichagof Island is known for having one of the highest densities of brown bears in the world—more bears than people! It’s a remote paradise perfect for those who love wilderness, fishing, and quiet exploration.
Bear Viewing Tours – unforgettable wildlife experiences.
Hoonah Village – home to Alaska Natives with deep cultural roots.
Kayaking & Hiking – serene waters and lush forests.
- Travel Tip: Visit between May and September for best access and weather.
- Learn more at Travel Alaska – Chichagof Island
6. Admiralty Island, Alaska
Area: 1,684 square miles
Location: Southeast Alaska
Known locally as “Kootznoowoo,” meaning Fortress of the Bears, Admiralty Island is home to about 1,600 brown bears—more than the island’s human population! It’s one of the most unspoiled wilderness areas in North America.
Admiralty Island National Monument – incredible bear and bald eagle sightings.
Pack Creek Sanctuary – guided bear-viewing experiences.
Kayaking Adventures – calm waters surrounded by dense forest.
- Travel Tip: Best visited in July or August for wildlife photography.
7. Nunivak Island, Alaska
Area: 1,625 square miles
Location: Bering Sea, Western Alaska
Nunivak Island is remote, wild, and culturally rich. It’s home to the Cup’ik people and offers visitors a glimpse into traditional Alaskan life. The island’s tundra landscape is dotted with reindeer, musk oxen, and countless bird species.
Cup’ik Culture – experience traditional dance, crafts, and food.
Wildlife Watching – musk oxen roam freely across the island.
Birding Paradise – especially in spring and summer.
- Travel Tip: Only accessible by small plane from Bethel—ideal for adventurous travelers.
- Learn more at Travel Alaska – Nunivak Island
8. Unimak Island, Alaska
Area: 1,590 square miles
Location: Aleutian Islands, Alaska
Unimak Island is the largest of the Aleutian Islands and marks the start of the famous island chain stretching toward Russia. It’s dramatic, volcanic, and absolutely wild.
Mount Shishaldin Volcano – one of the most active volcanoes in the world.
Izembek National Wildlife Refuge – wetlands full of migratory birds.
Remote Beauty – few people, endless landscapes.
- Travel Tip: Ideal for experienced hikers and nature photographers.
- Visit: U.S. Fish & Wildlife – Izembek Refuge
9. Long Island, New York
Area: 1,401 square miles
Location: Southeastern New York
One of the most famous and populated islands in the U.S., Long Island is where city life meets beach life. You’ll find everything from luxury mansions in the Hamptons to family-friendly beaches and vineyards.
The Hamptons – luxury beaches and summer homes.
Fire Island – car-free paradise with laid-back vibes.
Montauk Lighthouse – iconic spot for sunrise photography.
- Travel Tip: Perfect for summer road trips or weekend getaways.
- Explore more at Discover Long Island
10. Maui, Hawaii
Area: 727 square miles
Location: Central Pacific, Hawaii
Rounding out the list is Maui, the second-largest island in Hawaii. Known as the “Valley Isle,” Maui is all about lush valleys, scenic drives, and golden beaches.
Road to Hana – one of the most scenic drives in the world.
Haleakalā National Park – sunrise above the clouds at 10,000 ft.
Whale Watching – from December to April, humpback whales migrate here.
- Travel Tip: Visit May to October for sunshine and fewer crowds.
- Official site: Go Hawaii – Maui
Final Thoughts: Discover the Island Wonders of the USA
From the tropical allure of Hawaii to the raw wilderness of Alaska, America’s islands are as diverse as the country itself. Whether you seek adventure, culture, or relaxation, these 10 largest U.S. islands offer unforgettable travel experiences in 2025.
So if you’ve ever dreamed of island-hopping without leaving the United States — now’s your time to explore these incredible destinations.
Frequently Asked Questions (FAQ)
1. What is the largest island in the USA?
The largest island in the U.S. is Hawai‘i (The Big Island), covering about 4,028 square miles.
2. Which U.S. state has the most large islands?
Alaska has the most large islands, including Kodiak, Prince of Wales, and Admiralty.
3. Can you visit all these islands easily?
Most are accessible by plane or ferry, though remote Alaskan islands may require guided tours.
4. Do U.S. citizens need a passport to visit Puerto Rico?
No, Puerto Rico is a U.S. territory, so no passport is needed for American citizens.
5. What is the best time to visit U.S. islands?
Generally, summer (May–September) is best for Alaska and winter–spring (December–April) for tropical islands like Hawaii and Puerto Rico.
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I am Sabiq Rasel is an Entrepreneur and broadcaster. I believe that every sip of coffee holds the potential for a moment of inspiration, creativity, and every cup tells a story.
