The 10 largest islands in the United States in 2025 showcase the incredible diversity of America’s landscapes, from tropical paradise to rugged wilderness. These islands not only vary in size but also offer unique cultures, climates, and recreational opportunities. Whether you’re interested in outdoor adventures, historic exploration, or simply relaxing by the water, these islands provide unforgettable experiences for travelers and residents alike.
1. Hawaii (Big Island), Hawaii
The Big Island of Hawaii is the largest island in the U.S., spanning over 4,028 square miles. It is renowned for its diverse landscapes, from volcanic deserts to lush rainforests. Visitors can explore Hawaii Volcanoes National Park, home to the active Kīlauea volcano, or relax on pristine beaches. The Big Island also offers opportunities for stargazing atop Mauna Kea, making it a favorite destination for both adventure seekers and those seeking tranquility.
2. Kodiak Island, Alaska
Kodiak Island covers roughly 3,595 square miles, making it the second-largest U.S. island. Known for its wildlife, especially the Kodiak brown bear, it attracts nature enthusiasts and photographers. The island features rugged mountains, dense forests, and abundant fishing opportunities. Kodiak’s small towns and remote wilderness provide a peaceful retreat for those looking to explore Alaska’s untamed beauty.
3. Puerto Rico
Puerto Rico, an unincorporated U.S. territory, spans approximately 3,515 square miles. With its tropical climate, beautiful beaches, and historic sites, Puerto Rico is a popular destination for tourists and residents alike. San Juan, the capital, offers vibrant nightlife, colonial architecture, and cultural festivals. The island’s lush interior features mountains, waterfalls, and rainforests, making it perfect for eco-tourism and adventure travel.
4. Prince of Wales Island, Alaska
Prince of Wales Island is the fourth-largest U.S. island at around 2,577 square miles. Located in Southeast Alaska, it is largely covered by temperate rainforest. Outdoor enthusiasts can enjoy hiking, kayaking, and fishing in its many rivers and coastal areas. The island is sparsely populated, offering visitors a sense of solitude and connection with nature.
5. Chichagof Island, Alaska
Chichagof Island spans roughly 2,080 square miles, making it one of Alaska’s largest and most scenic islands. Its mountainous terrain, old-growth forests, and abundant wildlife—especially brown and black bears—make it a hotspot for eco-tourism. Residents and visitors alike value its natural beauty, fishing opportunities, and remote wilderness experience.
6. Admiralty Island, Alaska
Admiralty Island covers about 1,646 square miles and is famous for its dense population of brown bears, estimated at over 1,600. The island’s pristine rivers and coastal areas attract anglers and wildlife enthusiasts. Its temperate rainforests and hiking trails make it one of the best spots in the U.S. to experience untouched nature.
7. Long Island, New York
Long Island is the most populous island on this list, with around 1,401 square miles. Stretching east from New York City, it features suburban communities, historic towns, and popular beaches like Jones Beach and the Hamptons. Long Island combines urban accessibility with recreational opportunities, making it a favorite for weekend getaways and family vacations.
8. Maui, Hawaii
Maui is the second-largest Hawaiian island at about 727 square miles. Known as the “Valley Isle,” it offers lush landscapes, volcanic craters like Haleakalā, and stunning beaches perfect for snorkeling, surfing, and whale watching. Maui’s mix of adventure and luxury resorts attracts families, couples, and solo travelers alike.
9. Oahu, Hawaii
Oahu, covering approximately 597 square miles, is famous for Honolulu, Waikiki Beach, and the historic Pearl Harbor. Oahu offers a mix of urban life, cultural experiences, and outdoor activities. Hiking trails, surf spots, and local food experiences make it a top destination for visitors in 2025.
10. Vieques Island, Puerto Rico
Rounding out the top 10 is Vieques, part of Puerto Rico, spanning approximately 51 square miles. Vieques is known for its bioluminescent bay, pristine beaches, and laid-back lifestyle. It’s ideal for families, honeymooners, and nature enthusiasts looking for a quieter tropical experience.
Final Thoughts On 10 Largest Islands in the United States in 2025
The 10 largest islands in the United States in 2025 highlight the diversity of U.S. geography, from tropical paradises like Hawaii and Puerto Rico to rugged Alaskan wilderness. Each island offers unique opportunities for recreation, culture, and relaxation.
Whether you’re seeking volcano hikes, wildlife encounters, historic landmarks, or sandy beaches, these islands provide unforgettable experiences. Planning a visit to any of these islands in 2025 guarantees adventure, natural beauty, and memories that will last a lifetime.
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