Population and Population Change

Back to the basics

Two of the simplest population statistics that demographers use are an area's total population and the amount of population change. Population totals can be found in decennial censuses and the American Community Survey using American FactFinder. In addition, population change can be determined by comparing population totals for the same area during two different time periods. Processes, which affect population totals, include migration, births, and deaths.


We have compiled total county populations for 1990 and 2000; numerical and percent changes in county populations; and what percentage, of the statewide total, each county's population represents  for South Dakota. Those interested in levels of net migration and the extent of its influence on the population from 1990 to 2000 may view a migration summary.


The Data Center has compiled several publications concerning population and population change. These include the following:


For information on population totals and/or processes influencing an area's population, please email or call us at (605) 688-4899.