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Simcoe County > Departments > Warden and CAO > Chief Administration Officer

Chief Administrative Officer

​The Chief Administrative Officer has responsibility for overseeing all functions and business activities of the County including delivery of a wide range of services to a growing population. Ranked as one of the fastest growing counties, the Corporation of the County of Simcoe delivers services to approximately  533,000 county-residents and the single-tier municipalities of the City of Barrie and the City of Orillia.

Mark Aitken is the Chief Administrative Officer for the County of Simcoe. Mr. Aitken's responsibilities include overall management for: 

  • Over 900​ km of County roads
  • Nearly 33,000 acres of County forests
  • Paramedic Services
  • Long Term Care and Seniors Services
  • Children and Community Services​
  • Ontario Works
  • Social and Affordable Housing
  • Planning
  • Emergency Management
  • Simcoe County Museum
  • Simcoe County Archives
  • Tourism Simcoe County
  • Municipal By-law Enforcement
  • Solid Waste Management​
  • LINX Transit
  • Lake Simcoe Regional Airport
  • Economic Development