McManus was born in Mountnugent, Kilbride Parish, County Cavan, Ireland, grew up there and settled in Mono Township in the summer of 1829. He was reeve for the township (1851-1873) and served as warden for Simcoe County in 1859.
McManus was born in Mountnugent, Kilbride Parish, County Cavan, Ireland, grew up there and relocated to Mono Township in the summer of 1829. He held the position of township reeve (1851-1873) and served as warden for Simcoe County in 1859.