Federalsburg, town (1990 pop. 2,365), Caroline co., E Md., on Delmarva Peninsula 19 mi/31 km ENE of Cambridge, and on Marshyhope Creek; 38°42'N 75°46'W. In agr. area (vegetable canneries, poultry-dressing plants). Mfg. (buttons, cutlery, plastics). Settled 1789 as Northwest Fork Bridge. Idylwild Wildlife Management Area is just N.