There are 9 US Post Offices in Parker County serving a total of 84,556 residents equating to 9,395 residents per post office. It's estimated that approximately 134,961 packages are handled across the 9 county post offices annually. Parker County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 116,927. The county seat is Weatherford. The county was created in 1855 and organized the following year. It is named for Isaac Parker, a state legislator who introduced the bill that established the county in 1855. Parker County is included in the Dallas-Fort Worth-Arlington, TX Metropolitan Statistical Area."