There are 6 US Post Offices in Mcculloch County serving a total of 8,441 residents equating to 1,407 residents per post office. It's estimated that approximately 13,473 packages are handled across the 6 county post offices annually. McCulloch County is a county located on the Edwards Plateau in the U.S. state of Texas. At the 2010 census, its population was 8,283. Its county seat is Brady. The county was created in 1856 and later organized in 1876. It is named for Benjamin McCulloch, a famous Texas Ranger and Confederate general. The geographical center of Texas lies within McCulloch County, near Brady.