| Mount Bullion | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | California#USA |
| Pushpin Label Position: | bottom |
| Pushpin Image: | California Locator Map with US.PNG |
| Coordinates: | 37.5072°N -120.045°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | California |
| Subdivision Type2: | County |
| Subdivision Name2: | Mariposa |
| Unit Pref: | US |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.611 |
| Area Land Sq Mi: | 0.610 |
| Area Water Sq Mi: | 0.001 |
| Elevation M: | 656 |
| Elevation Ft: | 2152 |
| Population Total: | 154 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Density Sq Mi: | 252.5 |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 95338 (Mariposa) |
| Blank Name: | GNIS feature IDs |
| Blank Info: | 233575; 2812657 |
Mount Bullion (formerly, Princeton and La Mineta) is an unincorporated community and census-designated place (CDP) in Mariposa County, California, United States. As of the 2020 United States census, it had a population of 154.[2]
A post office operated at Mount Bullion from 1862 to 1955, with a closure for a period during 1887. The place was first named "La Mineta" (for "little mine"). Then it was called "Princeton" for the Princeton Mine nearby. Finally, the name "Mount Bullion" was applied in honor of Senator Thomas Hart Benton, whose nickname was "Old Bullion" due to his fiscal policies.
The community is in west-central Mariposa County, along California State Route 49. It is 5miles northwest of Mariposa, the county seat, and 6miles southeast of Bear Valley, at an elevation of .
The Mount Bullion CDP has an area of 0.61sqmi, all but 0.001sqmi of it land.[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.