There are 11 US Post Offices in Trinity County serving a total of 13,049 residents equating to 1,186 residents per post office. It's estimated that approximately 20,828 packages are handled across the 11 county post offices annually. Trinity County is a county located in the northwestern portion of the U.S. state of California. As of the 2010 census, the population was 13,786, making it the fourth-least populous county in California. The county seat and largest community is Weaverville. Trinity County is rugged, mountainous, heavily forested, and lies along the Trinity River within the Salmon/Klamath Mountains. The county has no traffic lights, no freeways, no parking meters, and no incorporated cities. It did not have a chain store or restaurant until 1999, when Burger King, Movie Gallery (closed), Longs Drugs (now CVS/pharmacy), and Subway opened for business. Weaverville, the county seat, has the distinction of housing some of California's oldest buildings. The courthouse, built in 1856, is the second oldest in the state, and the Weaverville Drug Store has been filling prescriptions since 1852. The Joss House is an historic Taoist temple built in 1873."