Mount Bullion (formerly, Princeton and La Mineta)[5] is an unincorporated community and census-designated place (CDP) in Mariposa County, California, United States.

[3] A post office operated at Mount Bullion from 1862 to 1955, with a closure for a period during 1887.

[5] The community is in west-central Mariposa County, along California State Route 49.

[1] The town sits on a low divide between the headwaters of Agua Fria Creek flowing to the southeast and the heads of Norwegian Gulch and Green Gulch, which run west to Bear Creek.

Both creek systems find their ways southwest into the San Joaquin Valley.