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Ontario's last three institutions for adults with a developmental disability were:

Huronia Regional Centre in Orillia

  • When it opened: 1876
  • Originally called the Orillia Asylum for Idiots. It was renamed the Ontario Hospital School.
  • Resident population in 1971: 1,875
  • When it closed: 2009

Rideau Regional Centre in Smiths Falls

  • When it opened: 1951
  • Originally named the Ontario Hospital School, Smiths Falls
  • Resident population in 1971: 2,070
  • When it closed: 2009

Southwestern Regional Centre in Chatham-Kent

  • When it opened: 1961
  • Originally named the Ontario Hospital School for Retarded Children at Cedar Springs
  • Resident population in 1971: 937
  • When it closed: 2008

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