William traveled to Utah with his mother Sarah Ann Smith Fifield. He appears in the 1850 Utah census in the household of Levi and Sarah Fifield. In the 1856 and 1860 census he is in Pottawattamie County, Iowa with his maternal grandmother, Ann Billington and her husband Joseph. He married Mercy Ward in Council Bluffs, Iowa 1879 and died there in 1905.
His father, Levi Joseph Fifield, came to Utah in 1848 with the Ebenezer Brown pioneer company.