Collection place
- Oliva, Supe district, Lima Region34
- Olive Downs, New South Wales, Australia1
- Oljeto, Southern Utah, Utah1
- Ollantaytambo, Cusco Region, Southern Peru3
- Olorgesailie, Kenya35
- Olympic Peninsula, Western Washington16
- Omadasep village, Papua Province, Indonesia1
- Omadesep village, Asmat Regency, Papua5
- Omaha Reservation, Nebraska2
- Omaha, Douglas County, Nebraska3
- Oman17
- Omiš, Split-Dalmatia, Croatia4
- Omoka village, Cook Islands2
- On low ridge between Nv-Ch-7 and NV-Ch-8, Churchill County, Nevada7
- Ondo State, Nigeria2
- One Tree Hill, New South Wales, Australia6
- Onebabi, Arizona1
- Onitsha, Nigeria3
- Onondaga Castle, Onondaga Reservation, Onondaga County2
- Onondaga County, New York3