"This document contains the results of a population and economic base study that was prepared as an input to the subsequent land use and transportation plan studies for Madison and St. Clair Counties and as a supplement to socio-economic studies being conducted as part of the Metropolitan Land Use and Transportation Program. An inventory and analysis is made of demographic conditions, trends and projections are made on a five-year basis to 1985 for each County and their major components. Major economic trends and characteristics as well as the factors and variables affecting growth and development are identified, and the impact of existing and potential regional developments are evaluated with the use a probabilistic model. Long-term growth prospects for local basic industries are evaluated, and long-range economic projections of future economic activity and employment are made to 1985"--Preliminary page.