Collection place
- Recuay, Cajamarca Region, Northern Peru1
- Red Bluff, Tehama County, California2
- Red Butte, Coconino County, Arizona2
- Red Canyon, Southwestern United States2
- Red Cloud, Webster County, Nebraska1
- Red Lake, Coconino County, Arizona8
- Red Lakes, Navajo County, Arizona1
- Red Mountain, Trinity County, California2
- Red Rock Canyon, Santa Barbara County, California1
- Red Rock Island, Richmond, Contra Costa County1
- Red Rock State Park, Arizona2
- Red rock quarry west of Alpine, Brewster County, Texas5
- Redding, Shasta County, California283
- Redington Mesa (site 39), Pima County, Arizona1
- Redondo, Los Angeles County, California31
- Redwood Canyon, Napa County, California5
- Redwood City, San Mateo County, California21
- Redwood Creek, Humboldt County, California66
- Redwood Creek, Monterey County, California2
- Redwood Lagoon, Humboldt County, California5