There are 12 US Post Offices in Yellowstone County serving a total of 181,987 residents equating to 15,166 residents per post office. It's estimated that approximately 290,472 packages are handled across the 12 county post offices annually. Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 census, the population was 147,972, and a 2014 estimate put the population at 155,634. Its county seat is Billings. Yellowstone County is named for the Yellowstone River which roughly bisects the county from southwest to northeast. The river in turn was named after the yellow Sandstone cliffs in what is now Yellowstone County. Yellowstone County is included in the Billings, MT Metropolitan Statistical Area."