Family in Burlington for 1900 Census, married 14 years and had one child - three servants.

1910 Census. He is a banker, two children, four servants.

1920 Census has them with no children in the home. Still a banker with three servants.

“William Carson, Burlington's well-known banker, began his education in the public schools of his native town, and afterward studied in Burlington and in St. Paul, Minnesota, completing a high-school course. He next matriculated in Cornell University at Ithaca, New York, where he remained for three years. His initial step in the business world was made in connection with the lumber trade at Burlington as an employe of the Burlington Lumber Company, in which his father was interested. He did not depend upon parental influence to secure him advancement, but won his promotion as other young men did, and in due time became secretary of the company, and later its vice president. The business was incorporated, and William Carson contributed largely to the success of the enterprise, which is now one of the mammoth manufacturing concerns of the state, turning out twenty-five million feet of lumber annually, while the plant covers an area of fifteen acres. ... Mr. Carson also became a director of the Rand Lumber Company, controlling one of the extensive enterprises of that character on the river. He has voice in the management of other business concerns because of his financial and official connections therewith,, being vice president of the Rice Lake Company at Rice Lake, Wisconsin; president of the Boise Payette Lumber Company, of Boise, Idaho; vice president of the Cascade Lumber Company, of North Yakima, Washington, and a director in other lumber companies.
After demonstrating his ability to handle important manufacturing interests and to control the financial side of a business he" was called to the presidency of the First National Bank of Burlington,”
History of Des Moines County, Iowa: And Its People
By Augustine M. Antrobus
Published by The S. J. Clarke publishing company, 1915