Collection place
- Railroad station, Teotihuacán, Mexico2 objects
- Ramaditas Canyon, Tecate municipality, Baja California4 objects
- Ramsay Point, Multnomah County, Oregon3 objects
- Ranches of San Xavier, Dolores, and Santo Donienjo near Mission San Javier, Baja California Sur, Mexico70 objects
- Rancho Cordova, Sacramento County, California1 objects
- Rancho Santa Fe (CDP), San Diego County, California3 objects
- Ras Beirut, Lebanon1 objects
- Rat Islands, Central Aleutians, Aleutians West Borough1 objects
- Rattlesnake Canyon, Mineral County, Nevada1 objects
- Ray, Pinal County, Arizona1 objects
- Red Rock Canyon, Santa Barbara County, California1 objects
- Redding, Shasta County, California96 objects
- Redondo, Los Angeles County, California5 objects
- Redwood Canyon, Napa County, California3 objects
- Republic of South Africa20 objects
- Requa, Klamath (CDP), Del Norte County1 objects
- Resolute Bay, Queen Elizabeth Islands, Nunavut1 objects
- Rhode Island3 objects
- Rices Canyon, Honey Lake Valley, Lassen County1 objects
- Richmond Annex, Richmond, Contra Costa County1 objects