With the enactment of the County Incorporation Act in 1879 by the Nova Scotia Legislature, the district of St. Mary's was reorganized as the Municipality of St. Mary's. The Municipal Council of St. Mary's met in the Court House at Sherbrooke on Tuesday January 13th, 1880. John A. Kirk was unanimously chosen as Warden. The Councillors present were Daniel Hattie, Jau A. Fraser, John Gillis, Alexander Sinclair, Alexander Hattie, and Samuel Hawbolt. The Council discussed by-laws and finance, the appointment of ferry men, care of the poor, various appointments of local officials, and carrying out of statute labour on the roads and bridges.
The constables appointed for Sherbrooke were John C. Archibald, Matthew McGrath, William B. McLane, John W. McDaniel, William J. McIntosh and William O. Elliott. Overseers of the Poor were William L. Painter, H. N. McDaniel and William M. McDonald. Fence viewers for Sherbrooke were William Tate and D. Archibald (mill) and the local assessor Charles S. McIntosh, Esquire.(84)
For many years A. W. Cameron served as warden of the municipality. He was a Sherbrooke boy who was elected as member of the Legislative Assembly for Nova Scotia in 1956, and had served as municipal treasurer and clerk from 1940 to 1957.(85)
Sherbrooke has continued to the present time as the administrative centre for the Municipality of St. Mary's.