Police told reporters at a news conference in Vaughan, Ontario, the raids, conducted in July following a months-long investigation, produced five arrests, the Canadian Broadcasting Corp. reported.
One of the methamphetamine operations was in Campbellford, one in Warkworth and the third in Aurora, police said. Chemicals used to manufacture meth were found in a storage locker in Markham.
Police raided seven homes and businesses, and seized five vehicles along with $81,000 in cash, the CBC said.
The drugs were likely being produced for export outside Canada, Ontario Provincial Police Deputy Commissioner Scott Tod said.
"Canada is known as a methamphetamine exporter to other countries, especially the United States," Tod said.
The five suspects are scheduled to appear in court Monday in Oshawa.