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Collection place
- Rail Road Flat, Calaveras County, California6
- Ralik Chain, Marshall Islands1
- Rancho Tulucay, Napa Valley, Napa County2
- Rapides Parish, Louisiana1
- Rarotonga Island, Southern Cook Islands, Cook Islands1
- Ray, Pinal County, Arizona8
- Rayón, Chiapas, Mexico2
- Redondo, Los Angeles County, California9
- Rennell and Bellona Province, Solomon Islands2
- Reno, Washoe County, Nevada1
- Republic of Botswana2
- Republic of South Africa14
- Republic of the Congo10
- Requa, Klamath (CDP), Del Norte County11
- Rhode Island1
- Rich Gulch, Calaveras County, California6
- Rio Andirá, Brazil20
- Rio Arriba County, New Mexico2
- Rio Upano, Morona-Santiago Province, Eastern Ecuador6
- Riverside County, California123