The three states with the longest names in the United States are Massachusetts, North Carolina, and South Carolina.
1. **Massachusetts**: This state has 13 letters in its name. It is located in the New England region of the northeastern United States and is known for its rich history, including being one of the original 13 colonies.
2. **North Carolina**: With 14 letters, North Carolina is another state with a long name. It is situated in the southeastern region of the United States and is famous for its beautiful beaches, mountains, and vibrant culture.
3. **South Carolina**: Also with 14 letters, South Carolina shares the same length as its northern counterpart. Located in the southeastern United States, it is known for its historic sites, southern hospitality, and coastal charm.
These states not only have lengthy names but also offer a wealth of history, culture, and natural beauty.