There are 24 US Post Offices in Madison County serving a total of 80,322 residents equating to 3,347 residents per post office. It's estimated that approximately 128,203 packages are handled across the 24 county post offices annually. Madison County is a county located in the U.S. state of New York. As of the 2010 census, the population was 73,442. Its county seat is Wampsville. The county is named after James Madison, fourth President of the United States of America, and was first formed in 1806. Madison County is part of the Syracuse, NY Metropolitan Statistical Area."