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Region
- OECD countries1
- Oceania8
- Ohio12
- OhioChillicothe (Ross County)1
- OhioColumbus1
- OhioEuclid1
- OhioLockbourne1
- Oklahoma2
- OklahomaGuthrie1
- OklahomaLangston4
- Ontario2
- Ontario County (N.Y.)1
- Ontario, Lake (N.Y. and Ont.)3
- Ontario, Southwestern1
- OntarioToronto4
- Ontonagon (Mich.)1
- Ontonagon County (Mich.)1
- Oregon10
- OregonCorvallis1
- Orient1