The United States Census Bureau , as of July 1 , 2008 , estimated Alabama 's population at 4,661,900 , which is an increase of 214,545 , or 4.8 % , since the last census in 2000 . The United States Census Bureau , as of July 1 , 2008 , estimated Alabama 's population at 4,661,900 , which represents an increase of 214,545 , or 4.8 % , since the last census in 2000 .