There are 41 US Post Offices in Norfolk County serving a total of 699,411 residents equating to 17,059 residents per post office. It's estimated that approximately 1,116,338 packages are handled across the 41 county post offices annually. Norfolk County is a county located in the U.S. state of Massachusetts. At the 2010 census, the population was 670,850. Its county seat is Dedham. The county was named after the English county of the same name with the meaning \"northern folk\". Two towns, Cohasset and Brookline, are exclaves. Norfolk County is included in the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. Norfolk County is the 28th highest-income county in the United States with a median household income of $81,899. It is the wealthiest county in Massachusetts."