1. Google - Google is the most visited website in the United States, with an estimated 246 million unique monthly visitors. It is a search engine that provides users with access to information on the internet. Google also offers a variety of other services, such as Gmail, Google Maps, and Google Drive. 2. YouTube - YouTube is a video-sharing website that allows users to upload, share, and view videos. It has an estimated 200 million unique monthly visitors in the United States. YouTube is owned by Google and is the second most visited website in the United States. 3. Facebook - Facebook is a social networking site that allows users to connect with friends and family, share photos and videos, and communicate with others. It has an estimated 190 million unique monthly visitors in the United States. Facebook is one of the most popular social media platforms in the world. 4. Amazon - Amazon is an e-commerce website that offers a wide range of products, including books, electronics, clothing, and household items. It has an estimated 150 million unique monthly visitors in the United States. Amazon is one of the largest online retailers in the world. 5. Wikipedia - Wikipedia is a free online encyclopedia that allows users to contribute and edit articles. It has an estimated 130 million unique monthly visitors in the United States. Wikipedia is one of the most popular sources of information on the internet. 6. Twitter - Twitter is a social networking site that allows users to share short messages called tweets. It has an estimated 68 million unique monthly visitors in the United States. Twitter is a popular platform for news and information sharing. 7. Instagram - Instagram is a social networking site that allows users to share photos and videos. It has an estimated 64 million unique monthly visitors in the United States. Instagram is owned by Facebook and is one of the most popular social media platforms in the world. 8. LinkedIn - LinkedIn is a social networking site that is focused on professional networking. It has an estimated 48 million unique monthly visitors in the United States. LinkedIn is a popular platform for job seekers and recruiters. 9. Reddit - Reddit is a social news aggregation and discussion website. It has an estimated 46 million unique monthly visitors in the United States. Reddit is a popular platform for news and discussion on a wide range of topics. 10. Pinterest - Pinterest is a social networking site that allows users to share and discover new ideas through images and videos. It has an estimated 38 million unique monthly visitors in the United States. Pinterest is a popular platform for home decor, fashion, and food inspiration.