At the time of the 1851 Scotland Census Margaret Cowan, aged 17, born in Tarbolton Ayrshire, was working as a house servant for Anthon and Christiana Strathorn, farmers, in Fence Hyke, Tarbolton.
At the time of the 1861 Scotland Census Margaret Cowan, aged 25, born in Tarbolton Ayrshire, was working as a general servant for James & Kezia Bald at 22 Hamilton Drive, Govan, Lanarkshire.
At the time of the 1871 Scotland Census Margaret Cowan, aged 35, born in Tarbolton Ayrshire, was working as a general servant for her aunt and uncle Isabella & William Drinnan in Middleton, Tarbolton.
At the time of the 1891 Scotland Census Margaret Cowan, aged 57, born in Tarbolton Ayrshire, was living at 697 Govan Rd., Govan, Lanarkshire. With her were 6 lodgers, mainly from Ireland.