Hamilton Law Firm, P.C. Iowa Personal Injury Law Firm :: Hamilton Law Firm :: Des Moines, Storm Lake, Sioux City Hamilton Law Firm is Iowa's oldest family owned law firm and handles serious personal injury cases, workers compensation, negligence, wrongful death and civil rights with a full range of litigation and appeals services. We are an established Iowa law firm since 1876. Offices in Des Moines, Storm Lake and Sioux City Iowa.