In 2005 five Idaho institutions joined the Name Authority Cooperative Program (NACO) of the Program for Cooperative Cataloging in order to expand the underlying data that help library users find and identify resources and to improve cataloging efficiencies within the state. The objective of this study was to determine what effect this participation by Idaho institutions in the NACO program had on the authority control of Idaho agencies and other Idaho corporate entities. Data analysis of Idaho corporate name authority records showed this participation significantly increased authority control for these entities. In less than three years, Idaho institutions created more than 12 percent of the 1,763 Idaho corporate name authority records identified in the Library of Congress NACO Authority File.