Topaz (also, Topaz Post Office) is an unincorporated community in Mono County, California. It is located 3 miles (4.8 km) north of Coleville, at an elevation of 5033 feet (1534 m). Topaz's ZIP Code is 96133. According to the Mono County's government website, the population as of 2000 was 530.
The Topaz post office opened in 1885, closed in 1922, and re-opened in 1926. The name was transferred from the an original site of the village, which developed on the ranch of T.B. Rickey, which got its name from Mrs. Rickey from the color of the local quaking aspen trees.
Topaz is one of the three northernmost communities in Mono County. According to the Mono County government, Antelope Valley, including Topaz, is expected to see significant population growth.
Topaz is served by the Antelope Valley Fire Protection District, which was formed in 1947 and covers 33 square miles (85 km2) of the Antelope Valley. The District maintains a fire station in Topaz.
Topaz is served by the Antelope Valley Water District, which was formed in 1961.