Mountain Ranch (formerly, El Dorado and El Dorado Town) is a census-designated place (CDP) in Calaveras County, California, United States. The population was 1,628 at the 2010 census, up from 1,557 at the 2000 census. The town is registered as California Historical Landmark #282. The town center is quite little with fewer than 50 people vivacious in it. The 5 mile square Place surrounding the town accounts for the credit of the population.

The concurrence was established during the California Gold Rush. Mountain Ranch’s broadcast office was time-honored in 1858. In 1868, it was moved to out of the ordinary town called El Dorado Camp 1.5 miles south, as there was already an El Dorado make known office in California, El Dorado Camp became known as Mountain Ranch. Currently, there are 3 make known office buildings in the town. The present one, a little post office which was built in 1956, and a pronounce office built in 1923 which was later billed as the world’s smallest publish office. The original location of the town of Mountain Ranch also has a historical landmark. The bell on the historical marker was used in the local studious from 1885 to 1953. Established as Cave City School District in 1855, this speculative joined subsequently the Banner District in 1946 to become the El Dorado Union Elementary School District. In 1942 the last of the gold mines closed. Further economic losses took place in the 1970s, when local motto mills shuttered, and next in 1983 later the Calaveras Cement Co. closed. In 2015, the town was ravaged by the Butte Fire. More than 350 homes along the outskirts burned, but firefighters and local ranchers were skilled to save most of the downtown.

According to the United States Census Bureau, the CDP has a total Place of 41.2 square miles (107 km), of which 99.86% is land, and 0.14% is water.

At the 2010 census Mountain Ranch had a population of 1,628. The population density was 39.5 inhabitants per square mile (15.3/km). The racial makeup of Mountain Ranch was 1,472 (90.4%) White, 15 (0.9%) African American, 33 (2.0%) Native American, 18 (1.1%) Asian, 2 (0.1%) Pacific Islander, 15 (0.9%) from supplementary races, and 73 (4.5%) from two or more races. Hispanic or Latino of any race were 123 people (7.6%).