Republican League Register of Oregon, The Register Publishing Company, 1896, page 238.
MACKAY, HON. DONALD, of Portland, was born in Ontario Province, Canada, December 3, 1841. In 1865 he came to Portland and engaged in contracting and building, and is now extensively engaged in the lumbering business. In 1880 he was elected to the City Council, and served two terms. In 1888 he was elected to the state senate and sat during two sessions. He is again nominated for the state senate on one of the Republican tickets.