The population of Hagerstown city according to 2008 estimates by the United States Census Bureau is 39,728 , and the total 2000 Urbanized Area population is 120,326 ( ~ 80,000 in MD ) . The population of Hagerstown city proper , according to estimates conducted by the United States Census Bureau for a 12-month period ending 1 July 2008 , is 39,728 , and the total 2000 Urbanized Area population is 120,326 ( ~ 80,000 in MD ) .