There are 11 US Post Offices in Montgomery County serving a total of 214,579 residents equating to 19,507 residents per post office. It's estimated that approximately 342,492 packages are handled across the 11 county post offices annually. Montgomery County is a county in the U.S. state of Texas. As of the 2010 census, its population was 455,746. A 2013 estimate places the population at 499,137. The county seat is Conroe. The county was created by an act of the Congress of the Republic of Texas on December 14, 1837 and is named for the town of Montgomery. Between 2000 and 2010, its population grew by 55%, the 24th-fastest rate of growth of any county in the United States. Montgomery County is part of the Houston-The Woodlands-Sugar Land, TX Metropolitan Statistical Area."