At the time of the 1851 Scotland Census Hugh Cowan, aged 5, born in Tarbolton Ayrshire, was with his parents in Millarsland, Tarbolton.
At the time of the 1861 Scotland Census Hugh Cowan, aged 15, born in Tarbolton Ayrshire, was working as a farm labourer for Robert Wallace, farmer of 127 acres, in Hunterstown, Ochiltree, Ayrshire.
At the time of the 1871 Scotland Census Hugh Cowan, agedd 24, born in Tarbolton Ayrshire, mineral borer, and wife Mary, aged 26, born in Stair Ayrshire, were living in Coalhall, Stair. With them were children Elizabeth (4) of Ochiltree, Marion (2) of Stair, and Hugh (3 months) of Stair.
At the time of the 1881 Scotland Census Hugh Cowan, aged 34, born in Tarbolton Ayrshire, coal mine roadsman?, and wife Mary, aged 35, born in Stair Ayrshire, were living in Coalhall Cottage, Coylton Ayrshire. Present were children Elizabeth (14) of Ochiltree, Marion (12) of Ochiltree, scholar, Hugh (10) of Stair, scholar, Susan (7) of Stair, scholar, Margaret (5) of Stair, and Mary R. (7 months) of Coylton
At the time of the 1891 Scotland Census Hugh Cowan, aged 44, born in Tarbolton Ayrshire, underground fireman, and wife Mary, aged 46, born in Stair Ayrshire, were living in Loudonston, Ochiltree, Ayrshire. With them were children Hugh (20), general labourer, Margaret (15), Mary R. (10), scholar, Janet (7) of Coylton, scholar, James (4) of Coylton, Robert (1) of Ochiltree, Elizabeth Orr (24), granddaughter Mary R. Orr (4 months) of Ochiltree.
At the time of the 1901 Scotland Census Hugh Cowan, aged 55, born in Tarbolton Ayrshire, undergrd wooder & coal miner, and wife Mary, aged 56, were living in Loudonstonn Cottages, Stair, Ayrshire. With them were children Margaret (25), Mary R. (20), dressmaker, Janet (17), dressmaker, James (14), pit head worker at coal pit, Robert (11), scholar.
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Hugh Cowan, ploughman, married to Mary Ramsay, son of Hugh Cowan, drainage contractor (deceased), and Elizabeth Cowan M.S. Elliot (deceased), died aged 75 years as a result of acute pneumonia, Hugh Cowan of 93 Prince Edward Street Crosshill Glasgow, son, the informant.