Oscar Allen Clark was born February 4th, 1834, at the town of Milton, in Vermont. Died February 26, 1901, at Perkins, Oklahoma Territory, of Ulcerative Laryngitis. He was the fourth son of Charles and Eliza Clark. He attended school at the Swanton Falls Academy, Vermont, where he took a course in Higher mathematics and Civil Engineering. The latter occupation was followed during the greater part of his life.

In the spring of 1851 he came to Columbia County, Wis., where he taught school, and worked at civil engineering. Later he came to St. Croix Falls, and was elected to fill the office of county Surveyor of Polk county, being the first to fill that office in Polk county.

In the spring of 1853 his father and mother, with the rest of the family, came from Vermont to St. Croix Falls, soon after moving their home on Osceola Prairie.

In 1862 he joined the 10th Wisconsin Light Artillery Battery as Lieutenant. His last visit at home was in 1864, when he came home on a furlough. He went with Sherman on his march from Atlanta to the Sea.