The population estimation program to update population counts for all levels of geography in the nation will be very critical in the next decade.  Advanced computing technology allows data users to compile and analyze various data sources with detailed geography for important decisions.  Demand for population estimates for the detailed geography also increases.  The upcoming American Community Survey, which will eventually replace the long census form in the future, requires the most updated housing units and population counts for all levels of geography to do sampling and to produce appropriate statistics.