There are 9 US Post Offices in Monroe County serving a total of 96,161 residents equating to 10,685 residents per post office. It's estimated that approximately 153,484 packages are handled across the 9 county post offices annually. Monroe County is a county located in the U.S. state of Indiana, and determined by the U.S. Census Bureau to include the mean center of U.S. population in 1910. The population was 137,974 at the 2010 census. The county seat is Bloomington. Monroe County is part of the Bloomington, Indiana, Metropolitan Statistical Area.