Rents have also risen this year in nine of the 10 largest cities in the Washington region, including Bethesda, Md.; Arlington, Va.; Rockville, Md.; Germantown, Md.; Centreville, Va.; Alexandria, Va.; Silver Spring, Md.; and Frederick, Md. The only nearby city on ApartmentList.com’s study with a rent decline was Waldorf, Md., with a drop of 0.9 percent.