There are 16 US Post Offices in Cecil County serving a total of 99,886 residents equating to 6,243 residents per post office. It's estimated that approximately 159,429 packages are handled across the 16 county post offices annually. Cecil County is a county located in the U.S. state of Maryland. As of the 2010 census, the population was 101,108. The county seat is Elkton. The county was named for Cecil Calvert, 2nd Baron Baltimore (1605\u20131675), the first Proprietary Governor of the Province (colony) of Maryland. It is part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area"