The raid happened late Wednesday, while journalists from the CBC's Fifth Estate program were in the ultra-Orthodox Jewish community.
The police said they were executing a criminal warrant to search the premises — but an officer, who would not identify himself, refused to say what the allegations are or who is under investigation.
Police told all occupants of the houses to leave as officers searched for computers and other materials.
Officers were seen carrying away a box containing items seized in the search.
The action comes just days ahead of an Ontario court ruling on whether to seize and return 14 children to Quebec.
In court materials made public earlier this month, Quebec youth protection services alleged children as young as 14 had been married off.
The testimony in court alleged the children in the community could be in imminent physical and psychological danger.
The lawyer for the group denied the allegations.