The population estimates and projections to the year 2020 for Pottawattamie County are based upon specific assumptions regarding fertility, mortality, and migration patterns. These projections cannot be interpreted as statements of what necessarily will happen to population, they simply show what will happen if the assumptions upon which the projections are made prove to be correct. It is the responsibility of the user of this report to evaluate the reasonableness of the assumptions underlying the projections and to modify such projections if given different sets of assumptions.
Zipay, John P., "Pottawattamie County Population Projections: 1975-2020" (1974). Publications Archives, 1963-2000. 73.