Collection place
- Republic of the Congo120
- Republika Srpska, Bosnia and Herzegovina2
- Requa, Klamath (CDP), Del Norte County124
- Rescue, El Dorado County, California6
- Reserve Quadrangle, Catron County, New Mexico1
- Reserve, Catron County, New Mexico14
- Resolute Bay, Queen Elizabeth Islands, Nunavut4
- Retes, Chancay valley, Lima Region2
- Retiers, Brittany, France1
- Reunion Islands1
- Rhineland-Palatinate, Germany46
- Rhode Island10
- Rhodes, Dodecanese islands, Aegean Islands37
- Rices Canyon, Honey Lake Valley, Lassen County17
- Rich Gulch, Calaveras County, California60
- Richardson County, Nebraska4
- Richmond Annex, Richmond, Contra Costa County54
- Richmond Basin, Gila County, Arizona2
- Richmond County, North Carolina81
- Richmond Mills Village Site, Ontario County, New York1