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: 320439455 on 2015-03-02 10:01:34http://www.census.gov/popclockFederal Government StatisticsWorld Population Estimate: 7227787984 on 2015-03-02 10:01:34http://www.census.gov/popclockFederal Government Statistics