Collection place
- Old Fort Wright, Mendocino County, California4
- Old Fort, Upper Piqua, Miami County, Ohio2
- Old Havana, Havana, Cuba8
- Old Johnson Mound, Shasta County, California15
- Old Kaguiak, Kodiak Island, Kodiak Island Borough1
- Old Mission Dam, San Diego, San Diego County13
- Old Teslin, British Columbia, Canada1
- Old Town Site, Yakutat Borough, Alaska252
- Old Town, Penobscot County, Maine1
- Old US 40 highway 1.5 miles north of railroad, Churchill County, Nevada1
- Old Zuni Mission, Zuni, New Mexico1
- Old brickyard north of Tlaltenango, Cuernevaca, Morelos8
- Olduvai Gorge, Tanzania301
- Oleander, Fresno County, California1
- Oleh, Nigeria10
- Olema Creek, Marin County, California1
- Olga Bay, Kodiak Island, Alaska8
- Oliena, Nuoro, Sardinia82
- Olinalá, Guerrero, Mexico560
- Olintepeque, Quetzaltenango, Guatemala7