There are 32 US Post Offices in Columbia County serving a total of 60,780 residents equating to 1,899 residents per post office. It's estimated that approximately 97,012 packages are handled across the 32 county post offices annually. Columbia County is a county located in the U.S. state of New York. As of the 2010 census, the population was 63,096. The county seat is Hudson. The name comes from the Latin feminine form of the name of Christopher Columbus, which was at the time of the formation of the county a popular proposal for the name of the United States of America. Columbia County comprises the Hudson, NY Micropolitan Statistical Area, which is also included in the Albany-Schenectady, NY Combined Statistical Area. It is located on the east side of the Hudson River."