There are 8 US Post Offices in Blaine County serving a total of 12,205 residents equating to 1,526 residents per post office. It's estimated that approximately 19,481 packages are handled across the 8 county post offices annually. Blaine County is a county located in the U.S. state of Oklahoma. As of the 2010 census, the population was 9,785. Its county seat is Watonga. Blaine County is the birthplace of voice actor Clarence Nash, the voice of Disney's Donald Duck. Part of the Cheyenne-Arapaho land opening in 1892, the county had gained rail lines by the early 1900s and highways by the 1930s. The county was named for James G. Blaine, an American politician who was the Republican presidential candidate in 1884 and Secretary of State under President Benjamin Harrison."