Ten broadcast deals have been signed since the Olympics ended in London two weeks ago, ensuring coverage reaches countries like Iran, Mongolia and Pakistan.
Organizing committee chairman Sebastian Coe says the Paralympics will have "more athletes here than ever before, more countries competing and ... more media and broadcasters than ever before."
Organizers hope to wrap up further deals ahead of Wednesday's opening ceremony.
However, International Paralympic Committee President Philip Craven says he is "very disappointed" there will only be 5.5 hours of coverage — none of it live — in the United States, where NBC owns the rights.
About 4,200 athletes from 166 delegations will be competing.