| 1881 | 
      Oakland Mills | 
      United States Of America | 
      39.211626300156496 | 
	  -76.8439632 | 
	  "name"=>"Oakland Mills", "alt_name"=>"Village of Oakland Mills" | 
    
      | 1882 | 
      Oakland Park | 
      United States Of America | 
      26.17230650014662 | 
	  -80.1319893 | 
	  "name"=>"Oakland Park" | 
    
      | 1883 | 
      Oakley | 
      United States Of America | 
      39.153080800148054 | 
	  -84.4307088 | 
	  "name"=>"Oakley" | 
    
      | 1884 | 
      Oak Park | 
      United States Of America | 
      45.58172620040235 | 
	  -122.3894042 | 
	  "name"=>"Oak Park" | 
    
      | 1885 | 
      Oakview Terrace | 
      United States Of America | 
      35.26241859967054 | 
	  -80.8737628 | 
	  "name"=>"Oakview Terrace" | 
    
      | 1886 | 
      Oakwood | 
      United States Of America | 
      37.531811899917415 | 
	  -77.3993921 | 
	  "name"=>"Oakwood" | 
    
      | 1887 | 
      Oatfield | 
      United States Of America | 
      45.412525400423625 | 
	  -122.59465049999999 | 
	  "name"=>"Oatfield" | 
    
      | 1888 | 
      Oberlin | 
      United States Of America | 
      35.7962501997159 | 
	  -78.6605888 | 
	  "name"=>"Oberlin" | 
    
      | 1889 | 
      O’Bryonville | 
      United States Of America | 
      39.13210610014504 | 
	  -84.4621304 | 
	  "name"=>"O’Bryonville", "alt_name"=>"O'Bryonville" | 
    
      | 1890 | 
      Ocean Beach | 
      United States Of America | 
      32.74480669958976 | 
	  -117.24760670000002 | 
	  "name"=>"Ocean Beach" | 
    
      | 1891 | 
      Oceanlake | 
      United States Of America | 
      44.97586650047054 | 
	  -124.0125893 | 
	  "name"=>"Oceanlake" | 
    
      | 1892 | 
      Ocoee | 
      United States Of America | 
      28.56951859988339 | 
	  -81.544117 | 
	  "name"=>"Ocoee" | 
    
      | 1893 | 
      Odessa | 
      United States Of America | 
      28.1899720999251 | 
	  -82.5755788 | 
	  "name"=>"Odessa" | 
    
      | 1894 | 
      Ogden | 
      United States Of America | 
      45.644239100394046 | 
	  -122.58863720000001 | 
	  "name"=>"Ogden" | 
    
      | 1895 | 
      O'Hare | 
      United States Of America | 
      41.97516380048439 | 
	  -87.84424219999998 | 
	  "name"=>"O'Hare" | 
    
      | 1896 | 
      Ohio City | 
      United States Of America | 
      41.48438960044241 | 
	  -81.7124037 | 
	  "name"=>"Ohio City" | 
    
      | 1897 | 
      Old Colorado City Historic District | 
      United States Of America | 
      38.84532488568349 | 
	  -104.85854982566367 | 
	  "name"=>"Old Colorado City Historic District", "alt_name"=>"Old Colorado City" | 
    
      | 1898 | 
      Old Evergreen Highway | 
      United States Of America | 
      45.603060500399536 | 
	  -122.56125239999999 | 
	  "name"=>"Old Evergreen Highway" | 
    
      | 1899 | 
      Old Fourth Ward | 
      United States Of America | 
      33.764108499595146 | 
	  -84.37176289999998 | 
	  "name"=>"Old Fourth Ward" | 
    
      | 1900 | 
      Old Orchard | 
      United States Of America | 
      37.10736889986182 | 
	  -76.54495219999998 | 
	  "name"=>"Old Orchard" |