There are 10 US Post Offices in Dubuque County serving a total of 61,960 residents equating to 6,196 residents per post office. It's estimated that approximately 98,895 packages are handled across the 10 county post offices annually. Dubuque County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 93,653. The county seat is Dubuque. The county is named for Julien Dubuque, the first European settler of Iowa. Dubuque County comprises the Dubuque, IA Metropolitan Statistical Area, and is the seventh largest county by population in the state."