This directory aims to provide a comprehensive listing of manufacturing businesses operating within the state of Montana as of 1999. It serves as a reference tool for businesses, researchers, and individuals seeking information on the state's industrial landscape. The compilation is based on available data and industry surveys from the period.

The Montana Manufacturers Register, 1999, functions as a specialized reference work. Its value lies in its specific focus on the industrial sector of a particular state during a defined historical period. Such registers are typically utilized by businesses for market research, supply chain management, and networking, as well as by economic development agencies and researchers studying regional industrial trends. The utility of this particular edition is tied to its historical snapshot of Montana's manufacturing base.