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: 319000174 on nowhttp://www.census.gov/popclockFederal Government StatisticsWorld Population Estimate: 7195605580 on nowhttp://www.census.gov/popclockFederal Government Statistics