There are 39 US Post Offices in Onondaga County serving a total of 294,780 residents equating to 7,558 residents per post office. It's estimated that approximately 470,502 packages are handled across the 39 county post offices annually. Onondaga County (/\u02c8\u0252n\u0259n\u02c8d\u0251\u02d0\u0261\u0259/ ON-\u0259n-DAH-g\u0259) is a county located in the U.S. state of New York. As of the 2010 census, the population was 467,026. The county seat is Syracuse. Onondaga County is part of the Syracuse, NY Metropolitan Statistical Area. Joanie Mahoney (R) is the current County Executive"