Census Bureau Population Estimates: PopClockshttp://www.census.gov/popclockDaily US and World Population Estimates from the US Census Bureauen-usNonehttp://blogs.law.harvard.edu/tech/rssUS Population Estimate: 321623158 on 2015-08-28 23:11:40http://www.census.gov/popclockFederal Government StatisticsWorld Population Estimate: 7265677986 on 2015-08-28 23:11:40http://www.census.gov/popclockFederal Government Statistics