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Ohio 8,208 Oregon 6,872 Ontario 4,559 Oklahoma 3,614 Outer space 2,014 Oceania 1,779 OECD countries 1,179 Oxford 805 Ohio River Valley 635 Ohio River 568 Oxford (England) 376 Oakland County 312 Oakland 272 Oman 241 Oaxaca (State) 234 Orient 229 Oregon Territory 220 Orange County 217 Oaxaca (Mexico : State) 170 Oakland County (Mich.) 169 Ouganda 164 Onitsha 163 Oahu 162 Oakland (Calif.) 162 Ozark Mountains 158 Odisha 157 Oxfordshire (England) 151 Oregon National Historic Trail 138 Ottawa 121 Ontario, Lake (N.Y. and Ont.) 119 Oklahoma City 117 Omaha (Neb.) 116 Oxfordshire 113 Odisha (India) 112 Ottawa County 107 Okinawa Island 106 Omaha 100 Olympic National Park (Wash.) 99 Ottawa County (Mich.) 88 Owosso 82 Ondo State 80 Orkney (Scotland) 78 Ouagadougou 76 Oyo State 73 Ohio River Watershed 71 Ogemaw County 69 Oceana County 67 Orlando 67 Ottawa (Ont.) 66 Okinawa Island (Japan) 65 Ontario, Northern 65 Otsego County 65 Oceana County (Mich.) 63 Odesa (Ukraine) 63 Ontonagon County 63 Oklahoma City (Okla.) 62 Ondo State (Nigeria) 62 Oak Ridge 61 Okinawa-ken 61 Oyo State (Nigeria) 59 Osage Nation 58 Okinawa-ken (Japan) 57 Orange County (Calif.) 57 Ogemaw County (Mich.) 56 Ozark Mountains Region 56 Osceola County 53 Oak Park 52 Ogun State 52 Oaxaca Valley 51 Oświęcim 51 Odesa 50 Otsego County (Mich.) 50 Ogun State (Nigeria) 49 Ontonagon County (Mich.) 49 Ouachita National Forest (Ark. and Okla.) 49 Oaxaca 48 Olympic National Park 47 Ottawa Tribe 47 Ouachita River (Ark. and La.) 47 Orkney 45 Orléans (France) 43 Osceola County (Mich.) 43 Oslo 43 Osmanisches Reich 43 Oswego County 41 Old Northwest 40 Olympic National Forest (Wash.) 40 Outer Banks (N.C.) 40 Olympic Peninsula 38 Orange 38 Owens Valley 38 Oaxaca Valley (Mexico) 37 Okemos 37 Orlando (Fla.) 37 Ottawa National Forest (Mich.) 37 Oahu (Hawaii) 36 Osteuropa 36 Ouagadougou (Burkina Faso) 36 Ogden (Utah) 33 Outer Banks 33