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Henjes Conner & Williams, P.C. is a Certified Public Accounting and Consulting firm located in the Sioux City, IA metro area. The company was established in 1990 when six partners left their regional accounting and consulting firm to form a new company. To accomodate our growing staff and client base the firm relocated to a newly constructed office in Dakota Dunes, SD in June 2018... Henjes, Conner & Williams, P.C. is a Certified Public Accounting and Consulting firm located in the Sioux City, IA metro area. Established in 1990, the firm is committed to providing outstanding service to all of our clients, opportunities to all of our personnel, and a friendly and professional work environment for our staff. As a firm, we are committed to being contributing members in Siouxland, with a long-standing tradition of community involvement and civic responsibility.