Zenia, 95595, is located in Trinity County in northwestern California. According to TrinityCam: About 1865 a US Post Office was to be established, but there was no historical placename, so they took the name "Zenia". There is no "Zenia" without the Zenia Post Office. There are no commercial establishments remaining today. Some of the largest ranches in the County of Trinity are in the Zenia Area.