Population updates Population data from the United States Census Bureau may be updated either 1 Every ten years with data from the decennial United States Census or 2 Annually with data from the decennial United States Census and annual population estimates from the United States Census Bureau The following table shows when population data is available class wikitable United States Census Bureau Population Data Source align center Decennial Census align center Population Estimates Date align center April 1 of years divisible by ten align center July 1 of years not divisible by ten Region colspan 2 align center date population data available align center nation align center rowspan 2 December align center rowspan 2 December 1 align center state align center statistical area align center rowspan 3 February March of next year align center rowspan 2 April 1 of next year align center county align center places align center June 1 of next year Please contact me if you have any questions Yours aye