- USA Network: The 4400
 - Official site for The 4400, the science fiction series about a group of people who return to present-day Earth after having disappeared for 50 years. - 4400 Abductees
- Fansite and message board for The 4400, includes recent news, spoilers, and discussions about the sci-fi series.
- 4400 Guide, The
- Recaps and commentary on The 4400 series and its cast. Includes updates on other projects in which the actors are involved.
- 4400 Wiki, The
- A fan encyclopedia that anyone can edit for TV show, The 4400. Includes news, articles, character info, and episode guides.
- Fans of The 4400
- The 4400 reviews and commentary, with some interviews with cast members.
- IMDb: The 4400
- Cast, crew, and background information on USA Network's The 4400.
- The 4400
- Cast profiles and interview and fan forum for The 4400.
- The-4400.net
- Fansite dedicated to the science fiction series. Includes character and episode guides.
- TV Squad: The 4400
- Recaps and commentary on USA Network's The 4400.
- TV.com: The 4400
- Overview for The 4400, including episode summaries, recent headlines, pictures, and community reviews for the sci-fi series about a group of people who return to Earth fifty years after being abducted.
- TVGuide: The 4400
- Episode summaries, photos, video, and community blogs covering The 4400 on USA Network.
- UGO Screenwriter's Voice: Scott Peters
- Interview with the writer and creator of The 4400.
- Wikipedia: The 4400
- Wikipedia article about the USA Network series, The 4400.
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