The County of Renfrew is an upper-tier municipal government that is comprised of 17 municipalities, including:
- Town of Arnprior
- Town of Deep River
- Town of Laurentian Hills (Home to Canadian Nuclear Laboratories)
- Town of Petawawa
- Town of Renfrew
- Township of Admaston/Bromley
- Township of Bonnechere Valley
- Township of Brudenell, Lyndoch & Raglan
- Township of Greater Madawaska
- Township of Head, Clara & Maria
- Township of Horton
- Township of Killaloe, Hagarty & Richards
- Township of Laurentian Valley
- Township of Madawaska Valley
- Township of McNab/Braeside
- Township of North Algona Wilberforce
- Township of Whitewater Region
Founded in 1861, the County of Renfrew is the largest geographic county in the province of Ontario, stretching for more than 200 km along the shores of the Ottawa River from Arnprior in the east to the northern tip of Algonquin Park in the west and south to the communities of Hardwood Lake, Matawatchan and Calabogie.
The County of Renfrew is home to Atomic Energy of Canada Limited (AECL), situated in the Town of Laurentian Hills, and is Canada’s premier nuclear science and technology lab complex. AECL is managed and operated by Canadian Nuclear Laboratories (CNL) under a GoCo model, meaning government-owned, contractor-operated. Canadian Nuclear Laboratories is responsible for carrying out AECL’s mandate to enable nuclear science and technology and to protect the environment by fulfilling the government of Canada’s radioactive waste and decommissioning responsibilities. More than 2,900 researchers, scientists, engineers, technicians and research and development support staff are employed at Canadian Nuclear Laboratories, making it one of the largest employers in the County of Renfrew.
