There are 7 US Post Offices in Falls County serving a total of 18,499 residents equating to 2,643 residents per post office. It's estimated that approximately 29,526 packages are handled across the 7 county post offices annually. Falls County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 17,866. The county seat is Marlin. It is named for the original 10-foot-tall waterfall on the Brazos River, which existed until the river changed course during a storm in 1866. The present falls can be found two miles northeast of the original falls, at the Falls on the Brazos Park, a camping site located only a few miles out of Marlin on Farm to Market Road 712. Falls County is included in the Waco, TX Metropolitan Statistical Area. With a large portion of its economy based on agriculture, Falls County is sixth among 254 Texas counties in corn production."