According to his draft papers dated April 29, 1918 at Toronto, William Albert Cochrane of Mimico was born on August 24, 1897 in Mimico. He listed his mother Eliza Cochrane, Mimico, as his next of kin. He was 20 years and 9 months of age and stood 5 feet 7 1/4 inches in height. He had brown eyes, light brown hair and a fair complexion. He had a small scar on the front of his left ear. He was a Methodist.
According to the 1911 census he lived with his parents James and Eliza (and their large family) on Heman Street, Mimico.
According to the 1921 Toronto City directory he was living with his father James Cochrane on the north side of Heman Street, Mimico.
His brothers Samuel and James also enlisted.